this post was submitted on 09 Dec 2023
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What happens if you turn on the PC without plugging the power cable for the GPU? (lemmy.world)
submitted 2 years ago by 0Xero0@lemmy.world to c/pcmasterrace@lemmy.world
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So I was changing the case fans, after I put everything back together, I forgot to plug in the power for the GPU. I turned the pc on and I saw the white LED on GPU power port lid up and heard the fan spins like crazy (I don't know if it was the CPU fan or the GPU fans), I panicked and immediately turned off the power supply.

Everything happened in less than 2 seconds, I've run some stress tests and gamed for a few hours and nothing bad happened (yet?) so I assumed everything is still fine (for now?).

What happens if I had left it on like that for longer? And why did the fan ram up like that?

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[–] avidamoeba@lemmy.ca 65 points 2 years ago (1 children)

Nothing happens, the GPU doesn't turn on. You're all good.

[–] 0Xero0@lemmy.world 7 points 2 years ago (1 children)

Really? Thanks, I heard the fan rammed up to max speed the instant I turned the power on so it scared the shit out of me. Do you know which fan it could have been and why did it do that?

[–] HeyJoe@lemmy.world 11 points 2 years ago (1 children)

Could have been any of them, but I believe the one over the CPU would be my best bet. It's just a check to make sure it's working, and if it fails you will most likely see an error at the end of the post, which is right before the OS loads. GPUs are not required for most PCs to function unless you got a motherboard that does not have an on-board display output, in which case you just have no way of hooking up a display. If this was the case you could still get to the PC if you knew how to remote into it as well.

[–] 0Xero0@lemmy.world 0 points 2 years ago* (last edited 2 years ago) (1 children)

my motherboard has display output but my CPU doesn't have an integrated GPU so I need the graphics card for output.

btw, it just popped up in my head: What if I plug in the power without turning the PC off? Will something bad happen?

[–] luna@lemmy.catgirl.biz 6 points 2 years ago

The physical copper wire connection in the plug and socket is not instant and as its wiggled around, breaking and making connection in quick succession, will likely cause voltage and amperage spikes which can damage components on the gpu. In the best case nothing happens and you have a black screen until you power cycle your pc. Worst case is a dead gpu core.