*HELP* PSU or MTHRBRD issue?

[VexingLeon]

Hello all, 

My desktop will not turn on when I press the power button. It was working great the night before and never had any thermal issues. It has been running with no problems since July of 23. I have tried unplugging and replugging the power cables, the front panel cable, but I still get the same result. 
I’ve re-seated the RAM and the GPU. And even tried to jump my pc with the screwdriver on the power switch, but the pc will never turn on. 
I took it a step further and tested the PSU and made sure that it ran in another system and it does. 
I DO NOT KNOW WHAT TO DO! 
Is it the PSU, Motherboard, or is it something different.

 

Please Assist!

Thank you, 

VexingLeon

 

Hardware:

CPU: i5-12400

GPU: 6700 XT

MTHRBRD: Asus Tuf D5 z790

PSU: Asus Tuf 850w

SSD: Samsung 980&970 

 

[Tetras]

When you say "does not turn on", do you mean: there's no reaction whatsoever, no fans, no nothing? OR, does it just boot, everything runs, but a black screen?

[VexingLeon]

22 minutes ago, Tetras said:

When you say "does not turn on", do you mean: there's no reaction whatsoever, no fans, no nothing? OR, does it just boot, everything runs, but a black screen?

Yes, no reaction. No fans spin and no fan lights, nothing on my display 
the motherboard has its own lights that do turn on, but nothing happens when I press the power button 

[Crunchy Dragon]

1 hour ago, VexingLeon said:

Yes, no reaction. No fans spin and no fan lights, nothing on my display 
the motherboard has its own lights that do turn on, but nothing happens when I press the power button 

Are they diagnosis LEDs or just aesthetic RGB lighting?

 

Do the fans spin at all, or is the system just totally dead?

-Moved to Troubleshooting-

[VexingLeon]

1 hour ago, Crunchy Dragon said:

Are they diagnosis LEDs or just aesthetic RGB lighting?

 

Do the fans spin at all, or is the system just totally dead?

-Moved to Troubleshooting-

Just aesthetic LEDs, the fans don’t spin at all. I looked on YouTube and tried a paper clip to the motherboard connector from the PSU and the PSU runs when the paper clip is inserted to the correct sockets. So i think maybe it’s my motherboard?

[OnionRings]

If you tested the PSU in another PC and it worked, then chances are its not the PSU. Do you have another board you can try with your rig? Its a far stretch but sometimes we enthusiasts do have extra parts lying around to try.

[VexingLeon]

43 minutes ago, VexingLeon said:

Just aesthetic LEDs, the fans don’t spin at all. I looked on YouTube and tried a paper clip to the motherboard connector from the PSU and the PSU runs when the paper clip is inserted to the correct sockets. So i think maybe it’s my motherboard?

@Crunchy Dragon

[Crunchy Dragon]

18 hours ago, VexingLeon said:

Just aesthetic LEDs, the fans don’t spin at all. I looked on YouTube and tried a paper clip to the motherboard connector from the PSU and the PSU runs when the paper clip is inserted to the correct sockets. So i think maybe it’s my motherboard?

Motherboard sounds more likely for sure.

 

PSU is ruled out because it worked in another system.

[atarione]

have you actually ruled out the switch (power switch on case?)??

 

If not unplug pwr swtich header on front panel connector  (power off / unplug) then plug in turn on power supply and then with a flat screw driver tap the power switch header pin to make contact... see if system powers on.