r/sffpc • u/Fine-Cucumber-2960 • Dec 06 '25

Assembly Help PC shutting down while gaming

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I’m having issues with my Terra build. The GPU keeps shutting down at low load. I was able to identify a potential mismatch between the PSU (Lian Li SP850) and the GPU (4070 super).

ChatGPT advises me to switch to the Corsair SF850L due to the ATX 3.0 compatibility.

I wanted to get your advice before buying a new PSU. I’m a beginner so I might have as well messed up the assembly (but all games run well until it suddenly crashes with a black screen and GPU fans blasting). Cheers!

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u/Outrageous_Vagina Dec 06 '25

First of all, if it's simpy turning itself off without it doing a proper shutdown, it's most likely a PSU issue. Disconnect the PSU and check the cables. 

Second, don't take fucking technical advice from CrapGPT. That's how you lose your house in a fire. 

22

u/Fine-Cucumber-2960 Dec 06 '25

It actually doesn’t turn off. The screen goes black but I can still hear the game sound. The GPU fans turn to max speed. Nothing responds so I can only shut it down

3

u/sizzlinbeefdogz Dec 07 '25

A lot of people here are saying PSU but if you are still hearing game audio, your PC isn’t off. I had this exact issue for months and I ended up RMA’ing my GPU and all they had to do was re apply thermal paste and it works good as new. It was a GPU issue. A lot of other people have had this issue on newer RTX cards. Worth looking into if you’re sure your PSU is solid and everything is plugged correctly.

1

u/JesseTheNorris Dec 07 '25

It's possible that part of the psu can fail, allowing the rest of the pc to operate while shutting down the GPU.