[SOLVED] Motherboard Won't Post With Heatsink Attached

[kenny_parsons]

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]

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.

 

[kenny_parsons]

@ron2456 I only ran the PC without the heatsink for a Max of 15 seconds at a time about every 5 mins. That shouldn't be too bad right?

 

[ron2456]

@ron2456 I only ran the PC without the heatsink for a Max of 15 seconds at a time about every 5 mins. That shouldn't be too bad right?

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.