I'm using a Dell Dimension 3100.

Since last night, everytime I boot up or reboot, the pc freezes at the
BIOS screen and only after pressing F2 or F12 will it continue to the
Windows logo screen and everything's ok after that.

It all started with an "Auto Adjust In Progress" message displayed
during bootup (freezes until I press F2), Windows logo screen and
Welcome screens but after running auto adjust on the 19" LCD, that
message disappeared.

But it bugs me to have to press a key to continue after each
Boot/Reboot.

Is it a problem with some corrupted files? I've run CHKDSK and all 5
steps are ok. Ran defragment too.

If it's not some corrupted files or something, and if it's also
possible, how do I get to not have to press a key to continue booting?

Thanks in advance for any help.