I recently transferred my graphics card, RAM, CPU, and SSD into a new case with a new motherboard and power supply. While everything was working perfectly on the previous motherboard, now my graphics card isn't sending any signal to the monitor on the new one. I've double-checked all the connections, reseated the graphics card, and even tried different PCIe x16 slots, but nothing seems to help. I also reverted back to the old motherboard and power supply, and it worked without a hitch. The graphics card lights up, so it seems to be receiving power, but everything else, including the fan LEDs, isn't functioning properly. I'd love to hear any suggestions because I'm at a loss here.
2 Answers
First off, make sure you’ve got all the power cables connected to the motherboard, especially the additional CPU power cable. Sometimes, those can be easy to overlook. If it still doesn’t work, you might want to try using the old power supply again to see if that changes anything.
Does your CPU have an integrated graphics unit? If it does, try connecting your monitor directly to the onboard HDMI or DisplayPort. It might help narrow down if the issue is with the graphics card or something on the motherboard.
We did test connecting the monitor to both the onboard HDMI/DP and the graphics card, but no luck there either. We even tried VGA from the onboard, and still nothing.

Thanks! I’ll check the power cable, but unfortunately, the new motherboard isn’t compatible with the old power supply.