Lets just logically trouble shoot this the easiest way. Plug in one hard drive (unless you are in Raid 0), and then pull out 1 stick of ram. Unplug any unnecessary item (optical drives, etc). Now let's test each stick of ram individually in each different slot. If it still does it after the ram troubleshooting, you don't have a ram problem. If you have a spare video card, put that in. If you get the same issue, you don't have a video card problem. Then you have narrowed it down to hard drive, power supply, or motherboard.
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