3 sticks of RAM works but 4 wont POST

website ram slot 3 and 4 not working On macOS, go to About This Mac > System Report > Memory Troubleshooting Laptop doesn't boot: Double-check the RAM seating No, not in your ramses book christmas edition slot 7PCIe slots Up to300Wauxiliary power One PCIe x4 gen 3 Apple IO card Four PCIe x8 gen 4 Two single height Two double height Two PCIe x16 gen 4 Double

ram slot 3 and 4 not working The general consensus is to use 2 + 4 if you need a little more clearance for your CPU fan, but 1 + 3 works just fine if that's not an issue for you Do RAM  Also try only one stick of RAM at a time in the first slot that the motherboard manual says to use  Slots 1 and 2 on my MB work fine but if I try 1 and 3 or 2 and 4 then all I get is a blank screen The fans etc are running but nothing is on

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