Question New GPU booted up - but after using it for an hour, the PC crashed and it doesn't boot anymore

[xslabs.sai]

System Details:
CPU: Ryzen 5 5600X
CPU Cooler: Deepcool Tower-style CPU Cooler with Gamdias ARGB Fan
Motherboard: MSI B450 Gaming PLUS
Ram: 2x Corsair Vengeance 8GB DDR4-3000. 1x ADATA Gammix D30 16GB DDR4-3200
GPU: Inno3D RTX 3080 X3 (the one I'm having a problem with)
Previous GPU: Zotac GTX 1650 4GB GDDR5
Testing GPU (the one which works as of now): Zotac GTX 1050Ti 4GB
PSU: Antec HCG1000 Extreme 80+ Gold, Age is around 2(?) years, bought it used
Chassis: NZXT H510
OS: Windows 11
Motherboard BIOS Version: Around the version where they started supporting 5000 series chips

I have a Ryzen 5 5600X, with an MSI B450 GAMING PLUS. I used to use a 1650 before, but I upgraded my PSU to 1000W and GPU to RTX 3080. I had installed it and everything ran fine, even in games with temperatures reaching 70 degrees. But after a while, PC just crashed and monitors blacked out. Fans and everything were still running but I had to force reset. On rebooting, the VGA EZ debug LED lights up.

I have tried taking out the CMOS battery and it didn't work. But when I swapped the GPU out for another one, after 2 tries I was able to get the PC running. On plugging in the 3080 again, the same VGA Led lights up but the PC doesn't boot, but the fans stay running.

The GPU itself is new, and it seemed to work fine when I bought it and today when I plugged it in my own PC. Please help. Thank you for reading through this.

 

[Lutfij]

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

I used to use a 1650 before
Did you remove all GPU drivers(intel, AMD and Nvidia) using DDU in Safe Mode, then manually installing the latest driver sourced from Nvidia's support site in an elevated command?

 

[xslabs.sai]

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

I used to use a 1650 before
Did you remove all GPU drivers(intel, AMD and Nvidia) using DDU in Safe Mode, then manually installing the latest driver sourced from Nvidia's support site in an elevated command?

I have updated the original post, thank you for pointing it out. And no, I didn't use DDU but once I installed the new GPU (RTX 3080) I updated the drivers using the NVIDIA App to the latest version (in elevated command). Everything seemed fine and I even ran a few games before the entire system crashed and I'm unable to reach POST.

 

[Lutfij]

PSU: Antec HCG1000 Extreme 80+ Gold, Age is around 2(?) years, bought it used
If you bought it used, what did it power prior to you picking it up and for how long was it used?

 

[xslabs.sai]

PSU: Antec HCG1000 Extreme 80+ Gold, Age is around 2(?) years, bought it used
If you bought it used, what did it power prior to you picking it up and for how long was it used?

It was powering a 5700X and a RTX 3080 12GB, seller claims to have used it for around 2 years.

 

[Lutfij]

So you have a 4 year old unit in your hands. You might want to source(borrow, not buy) a reliably built PSU from a friend or neighbor that can provide 850W of power to the entire system, in order to rule out your PSU being the root cause of the issue.

Your motherboard also has a Flash BIOS button, use this guide;

View: https://www.youtube.com/watch?v=cU7ZMmSmu20

and see if you can revive the platform.

 

[xslabs.sai]

So you have a 4 year old unit in your hands. You might want to source(borrow, not buy) a reliably built PSU from a friend or neighbor that can provide 850W of power to the entire system, in order to rule out your PSU being the root cause of the issue.

Your motherboard also has a Flash BIOS button, use this guide;

View: https://www.youtube.com/watch?v=cU7ZMmSmu20

and see if you can revive the platform.

I can update the BIOS manually if I want, by just plugging in the old GPU. I'll try messing with the power supply to see if it's the root cause.

 

[xslabs.sai]

So you have a 4 year old unit in your hands. You might want to source(borrow, not buy) a reliably built PSU from a friend or neighbor that can provide 850W of power to the entire system, in order to rule out your PSU being the root cause of the issue.

Your motherboard also has a Flash BIOS button, use this guide;

View: https://www.youtube.com/watch?v=cU7ZMmSmu20

and see if you can revive the platform.

I can still boot in using my old GPU. Runs fine. Moreover, I have noticed that the behavior of the debug LEDs (first CPU lights up, then BOOT for a brief second and then a constant VGA signal) is the exact same when I turn it on with my new GPU plugged in, and when I have no GPU plugged in at all. Now I'm really worried if the card is fried. The fans still spin though, and it gets warm, hot even.

 

[xslabs.sai]

Quick update, jumping the CMOS reset pins directly made the PC start up normally again, with the new card. Thanks for all your inputs. The problem no longer exists, hopefully.

And as for the first crash, I think my CPU got too hot. Really old thermal paste, I guess. Also my CPU runs at 4.5 GHz (literally, I checked) all the time so that definitely contributed. That's an issue in itself (welcome to help!) Orrrr it crashed due to another reason that will be a pain in my back later. F. Wasted my 4hrs, I guess.