Question Need help diagnosing problem

Jul 9, 2020
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I recently ran into a problem with my computer

It will not start at all (no fans spinning or anything similar) and I am currently trying to diagnose the problem.

I have tried

starting with bare essentials
shorting the power switch
paperclip test on psu started
a different psu
single ram slot

I am currently under the suspicion that it is either my mobo or CPU that is at fault.

Additional info

this problem happened once before and I just left my computer alone for a few days and it worked
when it was running I noticed that none of the CPU temp apps would work (this is after some time where they did)
I currently have my psu with different mobo, ram and cpu and it is working

specs

amd ryzen 5 3600x
ROG STRIX x470f-gaming
geforce gtx 1070
ddr4 16gb RAM
psu 750w

please help