Question No display or led light

Sep 24, 2020
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After removing cpu fan and putting it back no signal on display on monitor, after again removing and changing fan position as I thought maybe I put it wrong side there, was still no display + the led light wasn't turning on after changing sides. Had the same problem months ago, because I did everything the same, just forgot to never do it again.

After the first time I went to a repair man, he fixed it I even asked about thermal paste he said he didin't even touch it or there is no need in reapplying it. This time I removed thermal paste and reapplied it cause I thought maybe thats what it needs, I was blowing dust off it and had an idea maybe I had [CENSORED] it up. Removed everything and unplugged from case, left psu and power cable. Not starting(if it even should, I have no clue about pc engineering). Any clues what else might be wrong because I'm totally green on this and would like to save a trip to the repair man?
 

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