I have an old IBM laptop – model number 560E "Type 2640-40U". It worked fine until I tried to access the BIOS. To do that I tried to press random key combinations. At one point the computer displayed three icons, supposedly meaning Keyboard Not OK Report IBM. I made no big deal out of this, as keyboard errors 301 are common if you press keys during boot. The problem is that the keyboard does not work after that. I finally managed to access BIOS setup, the Fn keys work, but I can't interact with the operating system. Problem is not with the OS. I tried booting from a diskette, and can't even press Ctrl-Alt-Del. How to fix this?

The computer has no means of attaching a keyboard. It has only one PS2 port for a mouse.

Edited February 25, 200818 yr by j7n

I solved the problem. It turned out there is a standard button cell battery in the computer. I took it out and the machine forgot that keyboard error had occurred.

Got really freaked out as this computer was not mine.