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I had a situation like this and a friend suggested it might be faulty RAM. When I opened the computer there was a large dust-bunny between the two ram cards. Once I blew this out with compressed air, it worked fine. {I had the tower case sitting on the floor. After this I keep them on the desk.}
Reseating the RAM (as mentioned) might also be a good idea. Or even swapping the two RAM cards might reveal different symptoms and let you identify the problem.
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