I have a computer to be fixed and the problem is baffling me very much.
It was working fine until the computer was powered down suddenly - since then it tries to load Windows, but won't get past the list of "startup options", none of which work.
The built in CD drive is working (power wise) and is seen by the BIOS - but inserting a boot CD does nothing as it ignores this and goes straight to the Windows startup options which is pointless. I have checked the BIOS settings and they show the CD as a startup option, but no matter which order they're in the computer still ignores the CD during startup.
I have even plugged in a USB CD drive to see if it will boot from that - but the system ignores this too, even though it's seen in the BIOS as a possible boot device - and it works normally on another system running Windows.