5080 not detected by after repasting CPU
PC specs:
GPU: MSI NVIDIA GeForce RTX 5080 INSPIRE
Motherboard: ASUS B650-A ROG Strix AMD AM5 ATX Motherboard
CPU: AMD Ryzen 7 7800X3D
Ram: G.Skill Flare X5 Series 32GB (2 x 16GB) DDR5-6000
Ssd: Samsung Evo 1TB
PSU: Corsair RM1000x 1000 Watt Gold ATX Power Supply
This past weekend I decided to reapply thermal paste to my CPU as the temps were higher than normal at idle. I removed the cooler, applied new paste, put the cooler back on only to find my GPU now wont power on (fans don't spin at all) or be detected by the Motherboard. Nothing else to my knowledge was touched during this process and it is not my first time applying thermal paste or taking apart my PC. The VGA light on the motherboard turns on and the GPU shows no activity. When plugging directly into the integrated graphics the PC will start up into windows just fine with no issue but still the GPU shows no activity or that its being recognized. Before this the PC was working just fine without any overt issue other than the CPU temp at idle being higher than normal.
What I tried in increasing steps of desperation.
- Checked the 12v 2x6 cable on both the GPU and PSU to ensure they are pushed in all the way and not failing to make contact with the sensor pins.
- Took off the cooler again and check to that I was not over tightening the mount when putting it back on
- Reseated the GPU
- Changed the PCIe mode to Gen 4, Gen 5, then back to Auto
- Removed the CPU to check for damage to any pins and reseated it again. (verified everything working correctly again by starting from integrated graphics)
- Used two different new 12v 2x6 cable to rule out the possibility that the cable is the issue.
- Took my 5080 to my brothers PC to test out the GPU there to see if the it has failed. It worked just fine in his machine.
- Pulled out my old 3080 off another machine and put it into this one. It worked just fine, played a few games on it to see if it would fail, it did not.
- Replaced the PSU (Super Flower 1000w) and repalced all the power cables from the new PSU in case the PSU was the issue. Made no difference
- REPLACED THE WHOLE MOTHER BOARD (ASUS B850-A ROG Strix AMD AM5 ATX). Made no difference.
At this point I'm still in the same spot. The PC is using my old 3080 with no issue and the motherboard will refuse to detect my 5080 when I try it instead. I'm at a loss now, only thing i can think of next is to flash the bios but I'm not sure that will do anything since the issue happens identically on two different motherboards and started after no change to the bios was made on the first motherboard. Maybe my case is casing some kind of short? Maybe the CPU got damaged? Seems to work fine with my 3080 so I don't see how.
I'm mostly out of ideas and could use some suggestions. As mentioned all the independent parts seem to work but just not together with the 5080.
Appreciate any suggestions.