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Pc randomly restarts W fans speeding up

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Every few months my pc pulls this on me. After some time it goes away but comes back. My monitor goes black, fans speed up as u can hear in the video a second later slows down and does that for a few seconds. VGA light flashes for a second then boot flashes then pc turns back on. Sometimes when the fans do that high speed for a second thing it lasts a while, then all lights on the pc turn off but my ram sticks all stay on(color only). I built this last March and I know the gpu looks weird same with the ram don’t make fun of me for it I didn’t know what I was doing. I already tried using new power cables. I think it might be gpu but I just wanna check with someone who knows more than me before before I blow 500+ dollars. Specs are..

Ryzen 5 5600x
ICUE H150i
Msi mpg b550 gaming plus
Corsair vengeance 2x8 cl18 3600
O11 dynamic
9 ll120s
Corsair rm850x W
Twin edge oc 3050 8gb
 
g'day and welcome to the forums. :)

the increased fan revs would indicate a temperature issue.
either GPU, CPU, or chassis airflow in general.

how do all the case vents, fan blades and heatsinks look?
are you running any software to monitor the temps?

by the way - there is no video. (y)
 
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