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HP EliteDesk 800 G1 Tower turns off after a few seconds and then turns on, repeatedly.

HP EliteDesk 800 G1 Tower
Microsoft Windows 10 (64-bit)

I'm using HP desktop for a few months, today I turned it ON, it normally booted up then after like 5 seconds it turned OFF, it automatically turned ON again and after a few seconds turned OFF, the process keeps repeating.

 

I removed all the additional devices and memory sticks, cleaned them, started connecting devices one by one, the same problem existed. Finally, I found some article which said the problem may be caused by heated-up CPU, I just unplugged the FAN which was mounted over the CPU, the Fan was physically not removed, I turned on my CPU and used my Air Blower as a Fan by blowing Air on the UNPLUGGED CPU Fan, which made the Fan run too Fast, the computer was running ALL OK and I noticed, it was much faster than the previous sessions. When I turn OFF the Air Blower, the computer turns OFF and the same problem exists.

 

So far, I've diagnosed the problem, but need help to make it FIX.

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