Bluetooth device will not connect

Establish the scope

Confirm Windows can see its Bluetooth radio, then distinguish pairing failure from a saved device that connects but does not work in an application. Test the accessory with another supported host if available; an accessory already connected elsewhere may not accept the intended connection.

Apply the safer fix first

Remove the saved device, restart both sides, enter documented pairing mode, and pair again at close range.

Investigate the cause

For audio, distinguish paired from selected output. Update the radio driver and accessory firmware only from their makers.

Protect the recovery path

Follow the accessory pairing instructions and preserve another input method before removing a keyboard or mouse pairing. Do not erase all saved devices for one failed accessory.

Verification

• Reconnect the intended accessory and use its actual function, such as input or audio playback.
• Let it sleep and reconnect through its usual method, ensuring a competing host has not taken the connection.

When to stop

Do not continue with broader resets when the accessory cannot pair with any host or needs managed credentials. Preserve the observations already collected and use the device maker, network administrator, Microsoft support, a qualified repair technician, or data-recovery help according to the evidence.

Review the safe troubleshooting workflow before any broader recovery step.