We had a client with a similar problem: spontaneous reboots every once in a while. We test the computer, and it runs fine for hours on end. We only had one problem: 3D Mark would crash during the CPU tests.
We ended up swapping her Asus P4R800 (ati chipset) for an Asus P4P800 (Intel 865 chipset), which solved the problem. I dunno if it was the videocard or the chipset itself, but the combo was the problem. Hell, we had installed that (new) P4R800 in her system a week before, to replace a "defective" one.
The weird part is that we sold dozens of those systems in that period, and hadn't had a complaint from any of the other people. Not *one*.
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