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#21
Once Memtest finds errors, you can turn it off. You now know you have a RAM problem; but you still have to determine what the problem is: bad RAM stick, bad motherboard slot, RAM is mismatched, RAM is not compatible with the motherboard, bad memory controller (not really likely). To begin, pull all of your RAM except the stick in the first slot. Run Memtest on that stick for at least seven passes. If you get no errors, put that stick aside and mark it as good. Now test the next stick in the same manor and so on for all of your RAM sticks. Be sure to keep good RAM sticks separated from bad sticks.
If all sticks pass, take one good stick and test the second slot and so on until you have tested each slot. Post back with your results.