The graphics card could be malfunctioning.
The graphics card could be malfunctioning.
I started my PC this morning, it booted up properly except for the main middle monitor which seemed stuck trying to adjust settings. The other two monitors worked fine but didn’t change. I connected my Switch to the monitor and it functioned correctly. Then both remaining monitors failed to turn back on. I tried restarting the system, rearranging cables, moving them to different slots, and reseating the GPU. Still nothing. The CPU lacks built-in graphics, yet everything appears normal when powered on. There are no error codes or beeping on the motherboard. The GPU has operated well for years. What’s unusual is that the card’s status light keeps blinking and the fans aren’t spinning at all—though they’re not doing anything, so it’s unclear if the lack of fan noise is significant.
The GPU fans won't spin unless it gets too hot or is under heavy use. If you're near a Microcenter, go there; otherwise, take it to a local repair shop. They'll have spare GPUs for testing and additional CPUs and other equipment. If your CPU passes the POST test, the GPU is likely the issue, though anything could happen. Ensure the GPU is fully plugged in for power and data, and check that it isn't sagging—use a support bracket if needed. @Hinjima, @OddOod, and @strange13930 might also assist.