Okay, so over the last. . . couple of months I guess. Maybe a little longer. My computer has been doing the 'yay screen sorta goes black and has some blue and other noise at the side and then suddenly it's all black and it's restarting' thing.

It's pretty predictable about when it does this (well, as in it'll repeat the thing when I do the same things). At first I thought it was just the GIMP disagreeing, as I installed it and ran it and it rebooted. About three times in a row. But it's done it at other times. Like today when I was trying to defrag.

I've checked the temperature, since I seemed to have made the silly mistake of taking the heat sink off of the motherboard when cleaning it, (it was hovering around 51 earlier, and it still is now, but it hasn't done the reboot thing), and it doesn't seem to be that. I ran window's little error checker on C:\, thinking it might be a bad sector or something? Since it tended to happen with the same programs in the same ways, and it didn't say anything when it finished, which was sort of unnerving, and useless. and on stu's suggestion, I ran this memcheck-86 thing, and it didn't find any errors either.

So now what?