No Post system

[Aeroworks]

Mobo: Asus crosshair VIII

CPU: AMD X3700

PSU: SEASONIC focus px-750

RAM: 2x 16gig Gskill Trident Z neo (F4-3600C16D-32GTZNC)

Video: Asus strix 2080TI

 

Issue:

Computer shut off while playing game and will no longer post. When I press the power button, the PSU clicks once and nothing happens. The lights on the board are lit but the LCD for error codes never turns on. No fans turn on. The logo lights in GPU come in then off. Pcie power status lights on GPU remain on and white(red is no power).

 

Steps taken:

- left unplugged for an hour

- Reset bios and CMOS 

-Tested PSU with basic OEM tester. Fan on PSU starts

- Unplugged everything but cpu, 1 stick ram, GPU. 

-Tried with each ram stick in slot A2(primary dimm)

- Pulled and inspected CPU AND visible board caps. Looks okay visually. 

- confirmed power supplied to GPU

 

At this point I can't tell if it's the CPU, board or GPU. And I don't have any compatible components to swap in and out to test. Any insight on what could be the problem? 

 

Not sure if I would get an error code on the boards error code LCD without the GPU installed. Currently it makes no difference if it's in or out.

 

If I pull the CPU and turn on, everything is the same except no click on PSU. 

 

I tried swapping in an old GTX-460 GPU that has a PCI-Express 2.0 x16 interface. Did not change what happens when I try and boot system. Not sure if a pcie 2.0 is compatible with the board though. 

[191x7]

Well, Greg Salazar, in his "Fix or flop" youtube series where he fixes systems for free, encountered multiple systems with failed Zen2 CPU-s, some of which had the same symptoms as yours. 

 

I would recommend trying a different CPU and trying that CPU in a different system.

[Aeroworks]

5 hours ago, 191x7 said:

Well, Greg Salazar, in his "Fix or flop" youtube series where he fixes systems for free, encountered multiple systems with failed Zen2 CPU-s, some of which had the same symptoms as yours. 

 

I would recommend trying a different CPU and trying that CPU in a different system.

Thanks, I'll check out his videos and see if I can gleen any insight. 

[Aeroworks]

If I remove the CPU, MEMORY, and GPU. Would the fans still spin on when I power it on? 

[Aeroworks]

Got it working....

But the damnedest thing happened.  I hooked up the new power supply and the thing turned on!  

BUT...

As soon as it came on I saw a flash of blue sparks and smoke came out of the motherboard.

The spark came from right here shown inside red circle on photo.  

So I looked closely at the area and saw a tiny spec of something. Used a q-tip to brush it out. I don't think this was the cause of the original problem because while I had the thing apart I cleaned and blew out the PC thoroughly. But I suppose it could have been there all along causing a problem. Powered on the PC again and it still worked. Seemed to boot fine. But still needed to add in my heatsink and monitor. 

Now the really weird part.  Out of curiosity, I removed the new PSU connections and plugged in my old PSU since the cables were all still there. And it booted up with the old PSU! Magic smoke indeed!  So I buttoned everything up and connected display and keyboard/mouse.  Booted right into the OS. I am typing on the PC now. Everything seems fine as far as memory is showing properly and storage devices. And the cpu fans that are connected adjacent to the spark area.  Will run some stress tests to see if any issues crop up. I feel lucky. And might just keep this new PSU on hand for future troubleshooting.