The bios of the board may notify you of them. A sudden change in memory can cause this. Or if like I said the values differ, in speed or timing settings to the prior 2x2 gb sticks fitted. Timing values should be stated. Anyway here they are. Best answer Mar 25,2: We no longer support that motherboard as we are unable to manufacture memory that would be compatible with it. We had planned apples to apples comparisons with other boards[…]