Well, unplugging the ethernet cable and restarting it resolved the problem. Phew. Lucky me..
I also have the problem of always getting the following error in the bios: "162 - System Options Not Set" (it is an hp compaq 8000 sff)
I've already found something on this forum where the bios would reset after rebooting.
Can this be fixed? I always have to click F1 before it starts booting, which is very annoying because I want it to start right away without having to click something...