Question 2 Dead GPUs or CPU/Motherboard Issue?

[martinch]

Hi all,

I built a new PC a few months ago after it looked like the CPU/motherboard in my old Z97-based PC had failed ("no signal input" on monitor, switching between GPU and iGPU didn't make any difference). I used all new components except for the GPU (EVGA GTX 970 SC), which I carried over from the old PC (GPU shortage). The PC has been used around once per week and had been trouble-free until a fortnight ago, when the monitor showed "no signal input" and the "VGA" debug LED on the motherboard was lit, indicating a GPU fault.

I ordered a new GPU (ASUS RTX 3060 Ti Dual Mini), installed it this weekend, and it's made no difference - the "VGA" debug LED on the motherboard is still staying lit, and there's no display output. I've checked that the PCI-E contacts are clean, that the 8-pin power connector & HDMI cable are connected correctly, and I've uninstalled and reinstalled it in case it wasn't seated correctly. The LED "stripe" on the board is illuminated, so it's definitely getting power. If I unplug the HDMI lead from the GPU and plug it into my laptop the monitor works, so I assume it's not a bad monitor/cable.

I'm now wondering whether I've received a DOA GPU (something I assume is relatively uncommon), or if the issue is more likely that the CPU or motherboard has "gone bad" despite only being a couple of months old, and if there's an easy(ish) way of working out which it's most likely to be? I don't have a box of spare parts, unfortunately.

PC specs: AMD Ryzen 5 5600X, ASUS TUF Gaming B550-PLUS, Corsair Vengeance 3200MHz C16 DDR 4 (2x8GB kit), Corsair RM750X PSU, Noctua NH-U12S, Fractal Design Define R4. Nothing is overclocked.

Thanks!

 

[Ralston18]

Are you able to test both GPU's in another known working computer or computers even? Just to confirm or otherwise verify that they either work or do not work.

You mentioned the new PSU: Corsair RM750X - correct?

What was the original PSU - make, model, wattage? Was it also a modular PSU? If so did you reuse any of the original PSU cables with the new PSU?

There are differences and it would not surprise me if some small difference in specs etc. caused something else to fail.

Maybe not immediately.

 

[martinch]

Are you able to test both GPU's in another known working computer or computers even? Just to confirm or otherwise verify that they either work or do not work.

I might be able to test it in my parent's computer next week, if I can find the 8-pin GPU power connector that goes with their PSU.

You mentioned the new PSU: Corsair RM750X - correct? What was the original PSU - make, model, wattage? Was it also a modular PSU? If so did you reuse any of the original PSU cables with the new PSU?

The PSU in my old PC was a Corsair AX760. When I built the new PC, I bought a Corsair RM750X for it. I did not use any of the cables from the old AX unit in it (I know that's a "no-no" ).