Earlier, you said this:

Quote:
It's the stock 64MB nVidia model that seem to work fine in the older OS.

Now that the older OS is failing, too, I'd take a look at that again, assuming I'm correct in that it locks up and doesn't ever get around to actually crashing.

I know you said that the whole system locked up and not just the video, but I've seen instances where a bad video card would cause those symptoms.
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Bitt Faulk