Question PSU works fine but when connected to MB it ticks the green light flicks on and off.

Jun 30, 2020
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So I have A D20 workstation with 1050 TI.
The problem now is that whenever I connect the power supply to the Pc the green light on the back of the PSU flicks on and off ... so I knew that the PSU is turned on and then off then on.. etc.
but it turns on without pressing the power button .. so I removed the power switch of the motherboard and it's the same ... actually I removed everything except the 12V (12 pins) cable and it still ticks ...
I did the PSU paper clip test and it works wit no ticking and the fans are running fine.
I tried resetting the CMOS jumper and it didn't work as well.
SO what would that be .. is that a short circuit on the MB or what.
I hope someone can point me in the right direction.
 

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