Question Black screens, no signal/video but audio still present. (Failing PSU? GPU?)

[TechusSlavicus]

Hi all, I'm in dire need of assistance, as of a few days ago my PC has started to "crash" while playing all sorts of different games. The issue manifests itself in that somewhere along the line while playing my monitors will just go full black and show no signal while there is still audio present in the background (e.g Spotify or Discord). The system does at no point turn itself off and the only course of action is pressing the power button once and letting it turn off or holding it down to force it off.

The specifications of my computer are:
CPU: R5 5600X
GPU: RTX 4070 (MSI Ventus 2X OC)
RAM: 2x16GB DDR 3200Mhz (Corsair LPX Vengeance)
MOBO: MSI B450 Tomahawk
PSU: Seasonic S12II 620W (my theorised culprit besides the GPU for now)

Things of note I've encountered, dwm application errors, lsass application errors (tho likely unrelated as I've observed them even without crashes, potentially anticheat software related for the video games?). Two times so far the PC wouldn't boot and the motherboard had the VGA light lit solid. Reseating the GPU the first time around seemed to have fixed my issue entirely for around a days worth until it happened again. The 2nd time it happened I've simply tried putting the PC on its side for reasons beyond even my comprehension, which also allowed the PC to then boot.

I've so far tried: Reinstalling drivers (with DDU), reverting to older driver versions, repairing disks/windows image through CMD commands, reseating the GPU as mentioned b4, ran a full Windows Defender scan and a Malwarebytes scan on my computer. My main suspicion is my PSU however I am also scared that it might be my graphics card just deciding to call it early. A 3rd option was also GPU sag? But it seems unlikely as the gpu model is a 2 fan, aka not that long?

I would appreciate any and all help trying to resolve this and will try to provide any extra information I mightve left out so far.

 

[Lutfij]

Welcome to the forums, newcomer!

PSU: Seasonic S12II 620W (my theorised culprit besides the GPU for now)
You should replace that PSU ASAP, it doesn't belong in your build, not in 2024. Source(borrow, not buy) a reliably built 650W unit from a friend or neighbor and see if the issue persists.

 

[TechusSlavicus]

Welcome to the forums, newcomer!

PSU: Seasonic S12II 620W (my theorised culprit besides the GPU for now)
You should replace that PSU ASAP, it doesn't belong in your build, not in 2024. Source(borrow, not buy) a reliably built 650W unit from a friend or neighbor and see if the issue persists.

Yeah I'm aware it should've been replaced at the same time when I upgraded the rest of the rig but didn't quite have enough for everything then hah.. I'll try find a PSU to test, or might just buy a new one anyways to make sure it isn't a future problem.

In the meantime I've attempted another change/potential solution, since the gpu power cables from the psu are 2x(6+2) pins I've swapped which 6+2 set is plugged into the card, thinking maybe the connector itself has deteriorated through time or otherwise. So far I couldn't recreate a crash after doing that, and I've pushed the GPU to it's max 200W powerdraw for several hours, which seems like good news but I'll keep testing it the next 2-3 days to have something a bit more conclusive