PC power/boot issues

[d3nny]

Over a year ago I built a PC with the following specs:

• Motherboard: MSI PRO Z690-A DDR4
• PSU: Corsair RM 750x
• CPU: Intel i9 12900k
• GPU: Nvidia RTX 3080
• RAM: 48GB DDR4
   

It worked perfectly until a month ago when it abruptly powered off while idle and would not turn back on. There were no lights or signs of activity from the motherboard.

 

I took it to a repair shop and they found the PSU had "blocked" itself as a protective measure due to an electrical issue. I also noticed melted plastic on my power cable, so I replaced both the power cable and extension cord.

 

Everything seemed fine for about a month until yesterday. When attempting to turn on the PC, it failed to power on again. I checked motherboard to see if there is any lights turned on and saw that the Ethernet port showed power. After unplugging and waiting a few hours, it magically turned on.

 

Today, I faced the same issue, but after repeatedly pressing the power button, it eventually started.

 

Is my PSU faulty?

Does anyone have ideas on how to further troubleshoot or confirm if the PSU is defective?

Or what else could potentially be the culprit here?

[aledsav1]

Anything potentially could be causing the psu to go into protect mode, it could be the psu itself but could also be another hardware item...very difficult to say.

 

I have had similar experiences in the past even removing the psu power cable did not work, and had to remove the 24 pin from the mobo, put back then pc starts

 

I am sure there will be those with greater insights into these issues