Scshadow said:
Vista has to be the culprit here. I've tried multiple boot cds.
I doubt very much Vista is the problem, Booting from a CD happens well before the OS takes control as it is a part of the POST Procedure,
The culprit could be a corrupt BIOS, a faulty CD Drive, A faulty IDE Cable,the CD is set as a slave not a master, the IDE slot is faulty and its not seeing the CD Rom as an Atapi device or the CD drive is not an Atapi compatible drive
Cures
Before doing anything remove the HD the OS is on, I have seen many HD's stop a CD Rom drive booting due to conflicts.
Reset the BIOS to defaults, then set the boot order to boot from CD Rom first.
Swap out the CD Drive and try again
Swap the IDE cable and try again
Check the CD Drive is set as a Master on the seconday channel, or put it on the primary channel and try again, to determine if its set correctly take a look at the jumpers on the back of the CD Rom, it should say which jumper is which, usually they are maked MAS, SLA, CD or similar.
Sorry if it sounds like I am teaching granny to suck eggs but sometimes its the simple things that stump us...
Regards