We set up our HP Pavilion All-in-One satisfactorily and install a few programs. However, when we next turned it on, it beeped for over a minute. Then a window popped up stating that there was an Unsupported Adapter Found. There was "Press ESC for Start Menu." Pressing ESC accomplished nothing. Then the PC shut down.
I found this completely mystifying. We don't have a recovery disk. I tried to order one but found there isn't any.
Pressing F11 didn't help. Is there anything I can do? It is under warranty, so we could take it back.
I solved the problem. I had plugged in a portable drive that I later removed. What apparently happened was that the system remembered that drive. When I tried to boot without it I got the error message. Today I plugged that drive in and booted. It worked and the PC booted.
Now I need to find a way to makeit forget about that drive.