I'm attempting to set up an Amahi server, and thus have taken an older PC and wiped it clean using DBAN. I'm now in the process of installing Ubuntu, but for some reason the computer refuses to recognize either form of Ubuntu I throw at it, even though it recognizes the Windows XP CD fine.

Things it can't be:

1. Boot order - I've tripple checked
2. A bad DVD - I've booted the live CD off of my Mac just fine.
3. A drive issue - the drive boots other cd's just fine, I've tested both an XP and the ultimate boot disk for windows... they are booting fine.
4. A drive conflict - I have unplugged the only hard drive, leaving the DVD drive alone, still no recognition.

I've tried both Ubuntu 12 and an older Ubuntu 10 CD, it refuses to recognize either one. It's like my computer has decided it will have nothing to do with Ubuntu.

Any help would be greatly appreciated.