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I had that board, it's a good one! Please provide your hardware specs or make them your signature as it gives others a start on diagnosing your troubles.
DaiShan is most likely correct that it's ram related, but it can also be your Power supply. Once you've posted your hardware specs such as how many sticks of ram and what brand,wattage, combined output power supply you have(info can be found on the sticker) the easier it'll be to narrow down your trouble.