G4 MDD freezing and boot problems

Recently bought an MDD dual 1.0 as an upgrade from a 400mhz sawtooth G4. It has seemed to work fine until today, but I haven't been doing much with it other than install software.
Installed software:
OSX 10.3.9(from combined update, not software update)
Pro Tools TDM 6.4.1 cs4
What's happening right now:
When booting, the monitor remains black until the Blue background "Mac OSX" loading screen starts. There is no gray screen with the apple logo, ever. Sometimes this period of blackness is less than a minute, sometimes it can go for up to 5 minutes before I get video. I have never had this happen on any mac, it's definitely the most unusual symptom.
The computer seems to completely freeze or become unusable within 5 minutes of light use.
I just pulled all PCI cards, thinking maybe that was the problem, but no luck.
A few other interesting points:
The fans seem to be running more than usual, so I'm wondering if this might be heat related. This has the least desirable thick aluminum heatsink. But I don't want to throw a lot of money at this machine if I don't have to.
When I got this computer 3 weeks ago it would not boot, but pushing the PMU reset button on the motherboard got it going right away. Just tried this again and it did not help.
Message was edited by: MNMinstrel

Solved the black background problem, I think. It went away when I plugged the speaker back in.
Still having issues though.
First, I ran techtool. When it gets to the last test, volume structure, it gets slow, then automatically reboots. I'm wondering if I might have a bad hard drive.
Rebooting from the hard drive seemed to work okay initially, but as soon as CPU temp exceeds 58 degrees celsius the OS freezes. What is a normal temp for this computer, is it overheating?
Message was edited by: MNMinstrel

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