Motherboard Won't Post With Heatsink Attached

Feb 7, 2019
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Hey Guys,

For some reason my motherboard is only posting with my CPU heatsink removed.

I was building my PC today, and when I finished I started it up and the EZ Debug CPU light turned on. I turned off the PC, removed everything and started the motherboard outside of the case with the heatsink OFF. Sure enough, the motherboard posted and booted to the BIOS. I then put the heatsink back on thinking that the issue was resolved, started it and it wouldn't work.

I tried reseating the CPU, trying different RAM slots, nothing would work. Should I return the motherboard? Or is there something that I'm overlooking? Thanks for any help you can give.

MSI Z370-A Pro Motherboard
I5-8600k CPU
G.Skill Aegis 16GB DDR4 RAM
EVGA 550W PSU
RTX 2060 GPU
 

ron2456

Honorable
Nov 2, 2013
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Okay so you ran the pc without heatsink? I hope the cpu is not damaged at this point. I suggest change the Motherboard first as there is no way a PC would know if cooler is attached or not apart from temperaure sensors on the socket.
 

ron2456

Honorable
Nov 2, 2013
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Can't say anything as once my intel heatsink fell off and cpu shoot up to 100C. It was a pentium d.
But still I would start with a rma of the motherboard.

Also do check if the motherboard brass standoffs are installed or not.
 

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