step 1: i inserted XP pro with SP2 disc with the intention of formatting and re-installing.
everything was going fine until about half way through the installation, it asked for the SP2 disc (which, of course i didn't have one because it's already on the CD that was in there). it wouldn't let me go past that point. i rebooted, and same thing. it wouldn't even let me boot from CD anymore. checked the bios, and everything was fine.
step 2: i took the HD out of comp#1 and installed it on comp#2. formatted, and installed xp pro without any problems (same disc). so i put HD back into comp#1, and 'no operating system found'. still wont boot from CD.
step 3: used ultra ISO to make bootable USB key... tried it... wont bootfrom USB.
(meanwhile, i've checked the bios almost EVERY reboot just to make sure everything was set properly).
step 4: set bios settings back to default, and manually set everything i needed to...
still nothing worked (it's recognizing the HD, the USB, the CD rom etc, exactly how they should be... HD and CD are both set to master)
step 5: took out mobo battery, and left it for a few minutes, reinserted, and reset settings again... nothing...
step 6: re install Hd into comp#2... worked perfectly fine.
keep in mind that everything on comp#1 is OEM stuff. there has been no hardware changes whatsoever during this whole process...
anything would help.