Question PC random black screens and sometimes won't boot

Mar 5, 2024
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I have been trying to troubleshoot for a few weeks now, and I'm not sure whats going on.

1. Sometimes my PC can run for hours playing games, without issue. But sometimes, it goes to black within 15 minutes just being in windows.
When it goes to black, the PC is still running and powered on, and no error messages are to be found anywhere on the PC.
After a reboot, it works fine again.

I've checked for lose connections. Nothing.
Tried to use displayport from the motherboard, instead of the GPU, to see if it was the GPU that was the problem. Screen still goes to black randomly.

Checked CPU and GPU temps - they are all fine.

I'm thinking it's related to my second issue down below.

2. Sometimes PC won't boot.
Not booting, black screen, and powerbutton is blinking. Issue is solved by turning the PC off, and reseating the ram.
But it keeps happening at random, even after reseating the ram.

I figured it was either the DIMM slot or one of the RAM that was causing issues.
But I've tried using only 1 ram stick, in every DIMM slot, to see if that resolves the issue. But no.
Then repeated the process with the other ram stick. Still a problem.

Does anyone have an idea to whats going on ?


Processor I5-12600K
Motherboard asus prime z690-p wifi d4
16GB of ram - HyperX fury, 2400Mhz
RTX 3070 TI
EVGA Supernova 750 G2, 80 Plus Gold
AC 100-240 V - 750 Watt (220-G2-0750-XR)
Modelnr.: 220-G2-0750-XR
 
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brand and model of the psu?
Could it be the Power Supply is starting to fail ?
Found the receipt. Bought it all the way back in December 2015

EVGA Supernova 750 G2, 80 Plus Gold
AC 100-240 V - 750 Watt (220-G2-0750-XR)
Modelnr.: 220-G2-0750-XR
 
Used the PC for 4 hours yesterday.
This morning it wouldn't boot, and power button kept blinking.

Tried unplugging the power and waiting 15 minutes, before plugging in again.
Didn't resolve the issue.

Unplugged again.
Reseated a ram stick
Plugged back in
Starts up fine again.

Is it the RAM stick or is it the motherboard ?