This is not really an Ubuntu question but the problem came up when I tried to use a live Ubuntu CD.
I have a brand new Mecer PC with a Johannesburger motherboard - no PS2 ports. It runs like a dream and even manages to make Vista look quite speedy. The trouble is that it will not boot off the CD or a flash drive for that matter. Obviously the boot sequecnce has the hard drive first. So I need to get into BIOS to change the boot sequence. Except I can't change get into BIOS because I have a USB keyboard and my frantic pushing of F2 yields no result. Perhaps "Legacy USB Support" is not enables. Well, if I could get into BIOS, I could enable it ...
Helpful howtos such as http://www.intel.com/support/periphe.../cs-011939.htm from Intel themselves suggest that the best thing is to use a PS2 keyboard to get into BIOS and enable Legacy USB support. Good suggestion - except I don't have a PS2 port ...
I found the comment on another site: "I am using a USB keyboard, so I had to go into the guts of the PC and change the jumpers. I'd never have thought that was the problem."