Motherboard will not power up at all when cpu is installed.

May 26, 2018
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I just ordered the MSI Z370 M5 from Newegg along with a Coffee Lake i5-8650k and 16 gb of Gskill ddr4 pc2400 ram.

I installed them into my old case which is an Antec 300. My PSU is a couple of year old Antec 750 pure power.

My first go around i installed everything along with my gtx 970.

No power at all when I plugged in and powered up. No lights on the board, nothing at all. Eventually went to bed last night.

This morning after trying a bunch of different things I was able to get everything to power up and actually boot into Windows 10 64.

I downloaded the latest MSI utilities and was actually in the process of registering the motherboard when power just died and the system shut off. I will note that I had gone into the bios and enabled the two auto overclocking functions. It did boot after that and was running for probably 20 minutes before dying. The temps were looking great while it was running. When I tried restarting it looked like it wanted to start for a second, fans would try to spin up and stop, then nothing at all.

Since it died I have started over from scratch trying all the things that I did before when I finally got it to power up.

I honestly don't know which thing I tried that made it start the first time. But none of the same fixes seem to be working.

I have disconnected everything but the cpu and ram. Reseated the cpu, reseated the ram using different modules in different slots. Unconnected and reconnected both the 24 pin and 8 pin connectors multiple times. Pulled out the cmos battery and let it sit for 5 minutes a few different times. Tried a different psu, an OCZ 700w, no change. Checked my psu by plugging it back into the old mb with cpu and ram....that posted right away.

I am at the point where I am bread boarding. The mobo gets power when ram is installed but will not power on when the cpu is in the socket. I have checked the cpu for bent pins, I have been really careful with it and am sure it is positioned correctly.

I'm wondering if anyone has any other ideas? Is it something I am missing or do I maybe have a bad board, or a bad cpu. As you can imagine, after two days of working on this, I am pulling my hair out at this point.

Any suggestions would be greatly appreciated. Thanks!
 
The i5-8650k is not on the MSI Z370 GAMING M5 motherboard CPU compatibility list. I have no idea why it should not work on this motherboard, but it's not on the list. You could contact MSI Technical Support and ask them if your CPU is incompatible with the Z370 GAMING M5.
 
May 26, 2018
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Sorry, the cpu is actually i5-8600k. I entered it wrong in my previous post. I did look at the compatibility list and it is on there. Didn't know about that, thanks much for telling me about it.

Going to give it another go this morning and see what happens.

I did have it up and running yesterday morning, so will goof around with it some more.

I'm afraid I will have to ultimately rma either the board or the cpu :(
 
May 26, 2018
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Update: When I insert the cpu into the socket but do not close the face plate, something different happens. The fan on the psu starts to spin up then dies. After that you can hear it trying to start but stopping, this happens every few seconds. Tried it again with closing and locking the faceplate, back to no signs of life at all. Again the board does power up fine with no cpu in the slot. Grrr. Day 3 of trying to figure this out!
 

Could there be a problem with your CPU cooler? If you insert the CPU in the socket but do not close the face plate, there is no cooling, correct? The PSU may be shutting down to prevent the CPU from overheating.
 
May 26, 2018
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Thanks for your response. I get exactly the same response when I have the cpu cooler mounted and the fan plugged in. No signs of life at all. I removed all the thermal paste and am going to apply new paste and completely remount the cpu cooler and try again.

Thanks.

The cpu cooler is a a Cooler Master Hyper Evo 212.
 
May 26, 2018
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Reslotted cpu reset the whole cooler and fan, applied new thermal paste. No luck. Finally I flashed the bios which seemed to go fine according to the owner's manual and the lighting prompts.

Down to RMA. The question is RMA the board, the cpu or both? I will call newegg and see what they think I guess. Thanks all.