RTX 5070 worked for 20 seconds then black screen, the replacement won't "POST" at all
Hey everyone,
Specs:
- Ryzen 7 9800X3D
- RTX 5070
- 32GB DDR5 6000MHz
- MSI B850M Gaming Plus WiFi 6E
The story:
I just built my PC like 1-2 weeks ago. First RTX 5070 worked fine at first. Installed drivers, tested Minecraft. When I uncapped FPS, it hit around 2000fps or something, however the PC sounded like a jet engine, then after ~20 seconds → black screen. No video signal, but I could still hear game audio. PC seemed otherwise normal.
Tried a GPU benchmark → same thing, but instant.
Tested my old RTX 3070 → worked perfectly.
So I returned the 5070 (thought it was faulty) and bought the exact same model on Amazon. Used the iGPU while waiting, I played Minecraft and Geometry Dash.
Today: New 5070 arrived.
PC turns on. RGB lights up. Fans spin (including GPU fans). But no display signal and keyboard/mouse don't light up (they normally do when Windows loads or when I'm in the BIOS).
It's like the PC is on but won't POST or boot into Windows.
Tried basic troubleshooting, tried HDMI instead of DP...
Any ideas? Could it be a BIOS/PCIe compatibility issue? Bad luck with two faulty cards? Something else? Something seems really fishy, the first one could at least let me go in windows.
Thanks for any help.