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Help with AM5 cooler causing motherboard flex. [Solved] (sh.itjust.works)

submitted 4 months ago* (last edited 4 months ago) by [email protected] to c/buildapc

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I recently built a computer for someone. It was just for general use, not gaming or anything, so I went with fairly simple specs. Because they wanted an insanely quiet computer, I went with an NHD15S. The problem is that cooler causes flexing in the motherboard that makes the CPU not make contact with the socket. Is there a not overly janky way that I could fix that without getting a smaller cooler? I know flexing is the issue because it works for a while with the big cooler, but eventually won't boot after being shut down, or crashes in weird ways and then won't boot, and the mobo lights always show a CPU and dram light. The box cooler has no issues, but is louder under load.

Edit: it does boot with the large cooler if the system is on it's side. I followed the mounting instructions carefully.

Edit 2: Solved. I was overtightening.

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[–] [email protected] 5 points 4 months ago (2 children)

Is it mounted correctly? Usually motherboard flex from a cpu cooler is due to tightening things too much or mounting incorrectly in some way like using the wrong mounting hardware or the wrong holes/slots on the mounts.

[–] [email protected] 2 points 4 months ago

I don't think it's possible to over tighten a noctua heatsink. They have hard stops and you're supposed to tighten it to those stops.

https://noctua.at/pub/media/proslider/banner_lga1700_home_3.jpg

Ignore that it's the intel one, but you can't really overtighten this mount. I just thought, OP you have the backplate installed right?

[–] [email protected] 1 points 4 months ago* (last edited 4 months ago) (1 children)

I could be overtightening. I will try to be careful not to.

Edit: It appears you were right. Thank you.

[–] [email protected] 1 points 4 months ago

Awesome, glad you got it working!

[–] [email protected] 4 points 4 months ago

Review the manual again and redo installation. The cooler is not properly installed.

[–] [email protected] 4 points 4 months ago

Something else is wrong with your system if an NH-D15 is causing the system to not boot. The flex from the heatsink shouldn't be perceptible.

Are you missing a bunch of motherboard standoffs or something? Is your CPU not socketed fully somehow?

[–] [email protected] 1 points 4 months ago

I never knew overtightening was a real issue until it happened to me. I was going to send back my motherboard until I saw someone suggest to loosen the screws of my heatsink.

That actually worked.

[–] [email protected] -1 points 4 months ago

Fabricate a support bracket or turn the PC on its side.