I've put together a new PC build but I'm running into a problem where it won't boot properly when the GPU is installed. Everything seems to power up - the motherboard and GPU get power - but there's no display output. I tried removing the GPU and it booted fine using the onboard graphics. I'm wondering if this is an issue with the GPU itself, a compatibility problem, or something else entirely.
2 Answers
When you try to boot with the GPU, are there any lights on it, or does it seem to be doing anything? Maybe try booting with the monitor connected to the motherboard while keeping the GPU installed just to check if anything changes.
Since you mentioned the fans on the GPU don't start, that's also something to consider. They usually don't spin until the GPU hits a certain temperature, but if it's not even being detected, that could be a bigger issue. If possible, testing the GPU in another system would help determine if it's faulty.
This sounds like a pretty common issue. Since your system is booting with just the onboard graphics, it suggests there's something up with the GPU setup. First, double-check that all power connections to the GPU are secure. The RTX 4080 needs a 12VHPWR connector, which often comes with a 3x8-pin adapter. Some people have had to plug in only two of the three 8-pin connectors to get it to work, so that could be worth a shot.
Also, make sure your BIOS is updated and check settings related to the primary display - switch it to PCIe and disable CSM. If nothing works, and you can't test the GPU in another PC, it might be time to contact Gigabyte support or consider warranty options if it's defective.
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