Why does your laptop see every other device in the room and not the headphones sitting on your head?

The problem is almost always one of four things, and three of them are on the headphones, not the laptop.

Start with the headphones

1. Put the headphones in pairing mode on purpose. They do not automatically look for new devices. Most models need a long press of four to eight seconds on the power button until an indicator light blinks blue and red, or blinks blue rapidly. Turning them on normally just reconnects them to the last device.
2. Disconnect them from your phone first. This is the one that gets everybody. If the headphones are still connected to your phone in your pocket, they have no reason to appear as a new device on the laptop. Turn off Bluetooth on the phone, then try again.
3. Delete the old pairing on the laptop. Open your Bluetooth settings, find the headphones in the saved list, and remove the device. Then scan again. Stale pairing records are a very common cause of a device that will not reappear.
4. Charge them a bit. Some headphones will not enter pairing mode below a certain battery level.

If the laptop still sees nothing

• Toggle the laptop Bluetooth off and on in settings. Then restart the laptop if it is still empty. A surprising number of invisible Bluetooth problems are fixed by a restart.
• Check airplane mode. Obvious, and still the thing I forget most often.
• Move both devices away from the router. A router putting out a strong 2.4 gigahertz signal can interfere with discovery at close range.
• Update the Bluetooth driver on Windows laptops. Old drivers lose the ability to discover newer devices with newer Bluetooth versions.
• Try a different device. If your phone cannot see the headphones either, the problem is the headphones and it may be time to reset them.

Factory resetting the headphones is the last resort and the one that finally worked for me. The exact button combination is model specific, so look it up rather than guessing. Mine was holding both volume buttons for twelve seconds while off, which is not something you would ever figure out by trying.

Making it easier next time

Pair your headphones with your laptop in the morning before you leave the house, not when you need them. Bluetooth pairing is a five second job when nothing is at stake and an infuriating one when you are standing on a platform with a train arriving.