Well, guys... if you recall a thread I started trying to get help on why the mac pro was crashing... I finally narrowed it down. After speaking to about 4 different people at apple.... they had me run the Apple Hardware Test off the boot CD. I took out EVERYTHING except the 2nd DVD burner (Apple Branded Superdrive from my old 2.5 Dual G5)... and ran the test. The Hardware Test ACTUALLY FROZE IN THE MIDDLE OF THE RAM TEST. I thought I had bad aftermarket ram... as it wasn't playing nice with the Apple ram when I added them together. Looks like I had fine aftermarket ram... the Apple ram was bad. I REPLACED the Apple Ram with the Aftermarket Ram... and the Hardware Test completed fine. So, now I'm going to be calling them again in the morning and letting them know what happened. I wonder if they'll just let me RMA the bad ram, or if I'm going to have to lug this dang thing down to an apple store. I WONT BE HAPPY IF I HAVE TO DO THAT. We'll see! Oh, and no more lockups since switching out the ram... and all the other quirks (not able to burn CDs in Windows, sloooow Internet page draws, etc...) are all but gone now. Wild how a little thing like crapping out RAM can hose a system.