mac pro freezes during apple hardware test
I'm having numerous problems with my 2007 Mac Pro. Repeated kernel panics, without any recognizable repeatable behavior. Sometimes it shuts down on it's own. Sometimes it refuses to shut down and goes to grey screen. Sometimes on startup it get's stuck on the grey screen. Sometimes it refuses to Safeboot. Most recently I did an Apple Hardware Test using my system disc and it froze. I let it go for about 5 hours to see if anything would happen, but it was completely frozen.
Do all these various symptoms say anything to anyone?
Mac Pro, Mac OS X (10.7.5), 2007, 1TB, 7GB ram, UAD quad