Check this first
The short answer
Inspect Settings → Bluetooth & devices. If the switch is absent or disabled, inspect the PC adapter in Device Manager. If the switch works but one peripheral is missing, inspect its pairing mode and discovery settings. A missing item alone does not prove hardware failure.
- No usable switch: compare Settings in Step 1, then the adapter in Step 2.
- No adapter in Device Manager: inspect specifications, power and USB connection in Step 3.
- Bluetooth is on but one headset or mouse is absent: use the pairing checks in Step 5.
Identify where Bluetooth disappears
The adapter is the PC’s radio; the peripheral is the headset, mouse or other device you connect. These editorial branches use Microsoft’s guidance on detection and pairing, not reproduced hardware failures.
- Switch absent or unavailable: Windows may not be detecting or enabling the PC radio. Inspect its driver and device state before deleting saved headset registrations.
- Adapter appears only among hidden devices: This can include previously attached hardware. Code 45 means the device is not currently connected; the name alone does not establish availability. Compare power and USB connection.
- Switch works but one peripheral is missing: Check discoverability, battery, another connected host and Windows discovery settings. Whether a different peripheral can be found provides another comparison.
A device status saying it works correctly does not guarantee successful pairing or real use. Confirm the switch, current adapter and same peripheral in operation; a symptom or code alone cannot identify a failed component.
Official guidance behind these checks:
Choose your next check
Start with the row that matches your situation. Change one setting at a time so you can tell what helped.
| What you see | What to compare | Go to |
|---|---|---|
| Only the Quick Settings tile is missing | Check whether the Bluetooth switch in Settings still works. | Step 1 |
| The Settings switch is absent or unavailable | Record the PC adapter name, status and code. | Step 2 |
| Bluetooth is absent from Device Manager | Compare hidden entries, the model specification and USB adapter connection. | Step 3 |
| The adapter is disabled or shows a warning | Record its status and driver version; a warning does not identify a failed part. | Step 2 |
| It disappeared after a driver or Windows update | Compare update dates, KBs, driver version and symptom onset. | Step 4 |
| Bluetooth turns on but one peripheral cannot be found | Check pairing mode, battery, other host connections and discovery. | Step 5 |
| Connected, but silent or worse only during calls | Inspect sound routing or microphone-active audio mode separately. | Step 6 |
| It returns but disappears after restart or waking | Record when it disappears, adapter status and the preceding action. | Step 6 |
Check in this order
Continue this issue
Private notes stay in this browser. Nothing is sent automatically. Back up important notes on My Page. PC settings are never changed by this site.
Step 1: Compare Settings with Quick Settings
- Save work. Before radio or driver changes, have a built-in keyboard, touchpad or wired input available if you rely on Bluetooth controls. Contact the administrator for a work or school PC.
- Open Start → Settings → Bluetooth & devices and record whether the switch exists, is unavailable or can be enabled. Compare Quick Settings opened with Windows + A; labels can vary by Windows release.
- Inspect Settings → Network & internet → Airplane mode. Where normal wireless use is permitted, turn airplane mode off and recheck Bluetooth. If its switch is absent, use Step 2 rather than repeatedly looking for an On control.
- Open Get Help through Windows search and look for Bluetooth troubleshooting; Microsoft’s linked support page also offers the automated troubleshooter. Record its result or inability to run and choose the matching next check.
What the result means and what to do next
| Situation | What it tells you | Next action |
|---|---|---|
| Settings switch works | The Quick Settings display differs from complete loss of the radio. | For an absent peripheral use Step 5; if it connects and works, do not uninstall the adapter. |
| Settings switch is absent or unavailable | Inspect the PC’s detection and enabled state. | Use Step 2. |
| Troubleshooting restores the switch | The change and improvement are associated. | Connect and use the same peripheral; for recurrence use Step 6. |
- Expected result or what you learned
- You can distinguish the missing switch from a peripheral that is simply not discovered.
- If something is wrong or unclear
- A failed troubleshooter is not proof of radio failure. Record what remains missing.
- How to undo changes
- Record any changes reported by the troubleshooter. Restore airplane mode as required by the location’s rules.
Step 2: Read the adapter’s name and status
- Right-click Start → Device Manager and expand Bluetooth. Identify the PC radio, not the headset or mouse entry. Its name may include the manufacturer, Bluetooth or Radio; compare the exact PC specification if uncertain.
- Open the adapter’s Properties → General and record Device status. Also record the Driver tab’s provider, date and version. Copy the complete warning and code if shown.
- If Bluetooth is absent, choose View → Show hidden devices. A grey entry does not prove current availability. Record unknown entries under Other devices too; do not delete them by guesswork.
What the result means and what to do next
| Situation | What it tells you | Next action |
|---|---|---|
| Code 22 or disabled | The device has been disabled. | On your own PC, if you know why and it is appropriate, right-click the adapter → Enable device. On managed PCs ask the administrator. |
| Code 45 or only a hidden entry | It may be a currently disconnected device or past registration. | Use Step 3 for power, connection and specification checks; erasing history does not restore hardware. |
| Status says working, but the switch is missing | That status does not verify every setting or service. | Compare power in Step 3, then Step 4 if needed. |
| Another warning or uncertain adapter identity | Match the code and exact model documentation. | Check the supported driver in Step 4 and retain the status for Step 6. |
- Expected result or what you learned
- You have recorded whether the current PC radio is present, disabled or reporting an error.
- If something is wrong or unclear
- If no hidden entry exists either, use Step 3. Do not try to open properties for an absent adapter.
- How to undo changes
- Toggle Show hidden devices again to restore the view. Record the original state before enabling or disabling anything.
Step 3: Check hardware support, power and USB connection
- Separate previously working Bluetooth from a new PC being checked for the first time. Verify Bluetooth in the exact PC or motherboard model and purchased configuration. Working Wi-Fi alone is insufficient evidence; settings cannot add absent radio hardware.
- For a USB Bluetooth adapter, compare a direct connection to a different PC USB port without a hub and inspect Device Manager. Compare another available PC if practical. Do not open the case to remove an internal radio.
- If supported and previously working, save work, hold Shift and choose Start → Power → Shut down. Once fully off, wait one minute before starting. This is Microsoft’s normal shutdown comparison, not holding the power button to force a shutdown.
- After startup inspect both the Settings switch and Device Manager. If your model has a physical wireless switch, follow its manual. Ask the manufacturer about an unclear specification.
What the result means and what to do next
| Situation | What it tells you | Next action |
|---|---|---|
| Adapter and switch return after power-off | Recognition has returned after that operation. | Use the same peripheral and record any recurrence after normal startup or waking. |
| Only a direct connection or another USB port works | The original hub, port or path is involved. | Continue with the working path and inspect the original separately. |
| Supported radio remains absent | Driver, firmware or hardware investigation is still needed. | Use Step 4; do not decide to replace the PC from a missing switch alone. |
- Expected result or what you learned
- You can separate absent hardware support, temporary recognition loss and a USB-path-dependent symptom.
- If something is wrong or unclear
- If normal shutdown itself fails, do not repeat it forcibly; report the PC’s condition to its manufacturer.
- How to undo changes
- Return to a working USB connection. Do not disassemble the PC or reset BIOS without model-specific manufacturer guidance.
Step 4: Choose a driver action using before-and-after records
- Record recent Windows Update → Update history dates and KBs. If the adapter exists, retain Step 2’s driver version. Timing alone does not establish the cause.
- If it worsened after an update and the adapter is present, inspect Properties → Driver → Roll Back Driver. If available, compare after rollback and restart using the same switch, adapter and peripheral. If unavailable, use the manufacturer’s supported package instead of trying to force the button.
- If rollback is unavailable, the issue predates the update or the adapter is absent, find the Windows 11 Bluetooth driver for the exact PC model. For a USB adapter use its product manufacturer. Install only a matching supported package and restart.
- For a visible adapter, Update driver → Search automatically for drivers is another entry point. “Best driver” does not exclude a newer manufacturer release. Inspect Windows Update → Advanced options → Optional updates only for the identified product, distinguishing drivers from firmware.
- If updating failed and you choose reinstallation, first save a matching manufacturer package and arrange non-Bluetooth input and internet access. Uninstall only the identified adapter in Device Manager and restart; leave any driver-package removal checkbox unchecked for the initial comparison. If it does not return, use the saved supported package. If identity is uncertain, stop and ask support.
What the result means and what to do next
| Situation | What it tells you | Next action |
|---|---|---|
| Rollback or update restores the switch | The version change is associated with improvement. | Record versions and test the same peripheral and another normal restart. |
| Adapter remains absent after reinstalling | Driver work has not resolved detection. | Stop repeating uninstalls and use Step 6. |
| Bluetooth returns but the peripheral is missing | Discovery and pairing are now the next stage. | Use Step 5. |
- Expected result or what you learned
- You can record the version change and which part of detection returned.
- If something is wrong or unclear
- For a proposed firmware update, read the exact model’s instructions. BIOS/UEFI updates differ from ordinary drivers; do not bundle them into a general updater.
- How to undo changes
- If a previous compatible driver is retained, rollback may restore it; otherwise use the manufacturer’s recovery method. Do not assume firmware can easily be rolled back.
Step 5: Compare pairing and discovery for a missing peripheral
- Confirm the Settings switch turns on. Charge the peripheral, follow its manual to enter pairing mode and move it near the PC. Powering on alone may not make it discoverable. Temporarily disconnect it from another host such as a phone.
- Use Settings → Bluetooth & devices → Add device → Bluetooth. Select only your known device and complete its confirmation or PIN procedure; do not pair with an unfamiliar nearby device.
- If it is absent, inspect Bluetooth & devices → Devices → Device settings → Bluetooth devices discovery. Where offered, record Default and compare Advanced, which shows all device types. If the option is absent, skip it and use the comparison results.
- If spares are already available, compare another peripheral on this PC and this peripheral on another host, one at a time. Without spares, check pairing mode, battery and compatibility; do not buy equipment just to complete this comparison.
- Only for a registered device that will not connect, confirm you know how to pair it again, then remove that device via … → Remove device and add it again. Arrange alternative input first for a Bluetooth keyboard or mouse. Do not delete all registrations while the PC switch itself is missing.
What the result means and what to do next
| Situation | What it tells you | Next action |
|---|---|---|
| Other peripherals appear; only this one is missing | Prioritize that peripheral’s state, compatibility and host connection. | Follow its pairing guide; do not begin with a factory reset. |
| It appears on another host but not this PC | PC discovery or the driver combination warrants investigation. | Compare discovery settings and give support Step 4’s versions and results. |
| Connected but silent | Discovery has progressed; playback routing is now relevant. | Use the related Bluetooth-connected-but-silent guide. |
- Expected result or what you learned
- Check discovery, pairing and actual use as separate stages.
- If something is wrong or unclear
- Failure on another host still needs a check of discoverable mode and product compatibility before declaring hardware failure.
- How to undo changes
- Restore the discovery setting if it was only a test. Removed registrations require pairing again; they do not restore themselves.
Step 6: Verify real use and record recurrence
- Record three separate results: switch restored, current adapter present, and the same peripheral connected and usable. Test mouse input or the same headphone sound instead of stopping at a restored label.
- For connected-but-silent audio, use the related output guide. For quality changes at call start, use the Bluetooth audio guide. If Wi-Fi disappears too, retain adapter status and consult the Wi-Fi guide.
- Record whether recurrence follows startup, waking or an update. If the adapter remains present but disconnects, consult Microsoft’s dedicated disconnection guidance. Keep service or power-management comparisons device-specific; do not force settings absent on your model.
- Give support the PC model, Windows version, onset date, switch state, adapter name/code, driver version, update history and connection comparisons. An unresolved missing internal radio may need firmware or hardware inspection; ask what will be inspected before purchasing or resetting anything.
- Expected result or what you learned
- You can explain exactly what returned and which action reproduces the problem.
- If something is wrong or unclear
- If it disappears at the next startup, describe recovery as temporary. Stop repeating removal or update cycles and pass on the records.
- How to undo changes
- Restore test settings individually and keep the driver-version and pairing records.
When to ask for help
Describe three locations: the Settings switch, the PC adapter in Device Manager and the peripheral discovery list. Include which disappeared, recent updates and power/version comparisons. If the supported adapter remains absent even among hidden entries, request model-specific inspection. Do not start by deleting every registration, resetting Windows or applying another model’s BIOS.
FAQ
Does a missing Quick Settings tile require reinstalling the driver?
If the Settings switch works and the same peripheral connects and operates, separate a display issue from missing radio detection. Inspect the adapter only when Settings or real use also fails.
Does missing Bluetooth mean the PC is broken?
Not necessarily. Drivers, detection and enabled state can contribute. Compare the switch and current adapter, then seek model-specific help if supported steps do not restore them.
Why can Wi-Fi work while Bluetooth is missing?
Wi-Fi operation does not establish Bluetooth support or recognition. Check the purchased configuration and the Bluetooth adapter separately.
Can I use a hidden Bluetooth entry?
Hidden entries can represent disconnected hardware. Inspect status and its code; Code 45 indicates a device that is not currently connected. Its name alone is insufficient.
What if Roll Back Driver is greyed out?
That action is unavailable. Record the previous version if known and obtain a supported driver from the PC or USB adapter manufacturer. Do not delete unrelated drivers to try to enable the button.
Should I uninstall Bluetooth when only headphones are missing?
Start with their pairing mode, battery, another host and discovery settings. If other devices appear, prioritize the headset. Consider removing and pairing only that registered device when it will not connect.
What counts as Bluetooth being restored?
The switch works, the current adapter appears and the same peripheral connects and functions. If it disappears after restart or waking, retain the recurrence conditions rather than treating it as fully resolved.
Sources
English adaptation preserving the Japanese guide’s diagnostic branches, steps, outcome tables, precautions and source order. Official instructions were reviewed; the examples are editorial comparisons, not reproduced hardware failures. Record each change and compare the same device. Ask the administrator before changing a managed PC.
Microsoft: missing Bluetooth and powering offMicrosoft: settings, troubleshooting and discoveryMicrosoft: driver update, rollback and reinstallationMicrosoft: pairing Bluetooth devicesMicrosoft: connection and pairing againMicrosoft: Device Manager error codesMicrosoft Learn: viewing hidden devicesMicrosoft: repeated disconnections