I have an old computer that I am trying to reformat. When I get to "press any key to boot from CD", it won't work cause I'm using a USB mouse. It just boots into Windows. When I try plugging in a PS/2 keyboard it doesn't work (in the mouse port either). I need to do a fresh install, but if I can't hit a button to boot from CD then I don't see how I can do this. I made the CD-ROM the first boot device and all other boot devices disabled.