My fiancé and I are facing a bizarre issue with our PCs after moving his to a new location. Initially, his PC displayed no signal on the monitor, which we discovered was indicated by a VGA error light on the motherboard despite the GPU showing a power light. We tried troubleshooting by clearing the CMOS, swapping to his old GTX 1080, and then back to his RTX 4070 Ti. We also connected it directly to the wall instead of using his surge protector. Eventually, the no signal error disappeared, but the monitor remained black while the VGA light stayed lit.
To narrow down the issue, we put his 4070 Ti into my PC, which had been working perfectly before. Unfortunately, my PC then started displaying the same problem — not a direct 'no signal' but rather a black screen after the BIOS screen. After this, we switched back to my GPU, but my PC still isn't working. Any ideas on what could be wrong?
4 Answers
Have you tried using a different PCIe slot for the GPU? I know it can be tricky with limited slots, but sometimes re-seating the GPU in a different slot can resolve these issues.
Can you share the specs of your motherboards? I’ve seen some boards have a basic onboard display port for troubleshooting, even without dedicated graphics. Sometimes, an older VGA or DVI port can help isolate such issues.
It sounds like the CMOS may have cleared when you unplugged everything, which could indicate that the CMOS battery might be dead. This could have reset your BIOS settings back to the default onboard graphics output. I'd suggest connecting your monitor to the onboard graphics (if available) and then reconfiguring your BIOS to ensure the dedicated GPU is selected again. If not, double-check that both systems are set to use the correct video outputs for your graphics cards.
When you swapped the 4070 Ti for the 1080, did that setup work at all? And which graphics cards are confirmed not to work in either system? It sounds like you’ve already tested both GPUs in each other's setups, but confirming if all cards are causing the same black screen issue could help isolate the problem. Plus, are you certain that neither system has any onboard video capability?
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