After a reboot, the power icon is missing from system tray

It is set up to be always shown, but it is not.

The computer is a laptop.

Just a few hours ago:

Now:

You can use this batch script to reset icons cache in Windows 11 hope this will resolve the problem.

After several hours the icon re-appeared itself, without my action.

Anixx said:

After several hours the icon re-appeared itself, without my action.

Click to expand...

If there really was no action taken, if there really were no changes made, you might have a display driver problem.

You could try reinstalling it but, for all I know, it might be that there is no Windows11-compaible driver for your display adapter.

Best of luck,
Denis