this post was submitted on 09 Dec 2023
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PC Master Race

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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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[–] 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.