OK, so I finally got all the parts together for my new build:

(relevant parts)
Gigabyte GA-P35C-DS3R
2 sticks 1GB Crucial Ballistix 12864AA1065 DDR2 1066mHz
Core 2 Quad 6600 2.4G

The problem I've run into is that I can't get into the BIOS menu. I can run the memory test off of the Ubuntu install disk, and it reports errors with both sticks of RAM both as singles and paired. So at this point it would seem like a memory issue, although the chances of getting a matched pair of bad sticks seems kind of low.

But it seems odd that I wouldn't be able to get into the BIOS at all, even when I stuck in an old stick of Kingston 667. The machine will attempt a boot (Ubuntu installer gives about 20 consecutive seg faults) no matter what RAM I have installed. I know that the Ballistix should run at a higher voltage than the MB default and that may stabilize them, but I have no idea how to tweak it if I can't get into the d@@n BIOS. That makes me think it might be a bad BIOS chip or memory controller.

Sooooo... something is going back to NewEgg. What do you think? The RAM or the MB or both?