I have a quick question, I have a PC that is shutting down during the memtest. But prior to the reboot, there are no errors showing. The original problem was that Windows would state that it is shutting down (at random times and no event log that are worth mentioning) Is it pretty much a motherboard error then? I tested two different sticks of 512 RAM (one at a time) in different DIMM slots with the same results. The computer shuts down in the middle of the memtest with no errors previously showing and at random times during the test.