So run Memtest86+ If it fails, replace one DIMM at a time and retest until it passes; as soon as it passes, the DIMM you just replaced was bad. If it passes, r

So run Memtest86+ If it fails, replace one DIMM at a time and retest until it passes; as soon as it passes, the DIMM you just replaced was bad. If it passes, replace the motherboard, ideally under warranty.