Darkbreeze
Retired Mod
If you can't use the fourth slot, which is the A2 slot on your board (Yes, ASUS thought they'd be cute and swapped the locations of the slots on this board for some stupid reason) then you really can't properly use the board at all since the first pair of DIMMs are SUPPOSED to be installed in the A2 and B2 slots. And you are saying that with all the other slots populated, no matter which of the four DIMMs gets inserted in the A2 slot, that DIMM will not work, yes?
I'd pull the CPU and make sure there are no bent pins and that the CPU cooler to backplate bracket is fully tightened all the way around, but not TOO tight, and then also that the CPU cooler is fully seated all the way around, but again, not overly tight if it is an aftermarket cooler.
Unfortunately, that is probably a long shot although we do see it often enough, but the reality is that this is MOST likely a faulty motherboard. I'd make sure there were also no standoffs under the board in locations where they don't belong and nothing else that might be shorting any part of the board out. Pulling the board completely out of the case and building it with minimal hardware on the bench is probably a good idea as well but I think in the end this is either going to be a board problem or a CPU issue unless it is only a single DIMM that has this problem but it sounds like no matter what DIMM is installed in the A2 slot you have the same problem. Which means either board or CPU.
forums.tomshardware.com
I'd pull the CPU and make sure there are no bent pins and that the CPU cooler to backplate bracket is fully tightened all the way around, but not TOO tight, and then also that the CPU cooler is fully seated all the way around, but again, not overly tight if it is an aftermarket cooler.
Unfortunately, that is probably a long shot although we do see it often enough, but the reality is that this is MOST likely a faulty motherboard. I'd make sure there were also no standoffs under the board in locations where they don't belong and nothing else that might be shorting any part of the board out. Pulling the board completely out of the case and building it with minimal hardware on the bench is probably a good idea as well but I think in the end this is either going to be a board problem or a CPU issue unless it is only a single DIMM that has this problem but it sounds like no matter what DIMM is installed in the A2 slot you have the same problem. Which means either board or CPU.
How To - Motherboard bench testing
Finding the problem through bench testing If you are here then it’s likely you have encountered a serious hardware issue and have been unable to resolve it using the standard no-POST troubleshooting procedures. If you have not yet attempted to resolve your issues using the no-POST...
