Question Mystery issue with RAM causing boot problems.

Jul 8, 2019
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So there's an issue myself and a friend who works in IT spent half the day trying to figure out, and still hasn't been completely resolved.

This PC has been running for 2 years now. This morning when I powered it on, it didn't output to display.

My first assumption was that the GPU had died, so I tried switching to the onboard GPU. No joy.

Friend narrows down the issue, by observing that the PC was powering up, but wasn't really booting, as the CPU fans were starting up but not slowing down, which they should have if the PC was booting to Windows.

First port of call was removing a stick of RAM. That done, the PC boots up. Great.

Switch RAM sticks, and it boots up again just fine. RAM eliminated as the problem.

Switch RAM to the other slot, once again, PC boots up fine. That eliminated the slots as well.

Put both sticks back in, now the PC powers up but won't boot. Removing one stick does not resolve the issue this time. We reset the BIOS.

With one stick it boots. Put the other stick in, it stops booting again. Only way to resolve this is resetting the BIOS settings.

Any suggestions on what else to try or what could be causing the issue?
 
Windows 7 Professional 64-bit (6.1, Build 7601) Service Pack 1
NVIDIA GeForce RTX 2070
i5-7500
Corsair Vengeance LPX DDR4 2 x 16GB 3000MHz
Asus STRIX z270I