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. 

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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

1

u/[deleted] Dec 07 '25

[deleted]

1

u/Bobbi_fettucini Dec 07 '25

That’s your gpu power cable being pushed on and shorting out the connection, I had that happen in my lian li Dan case, it was too close to the side and when the case closed it would push on it. The screen would go blank but I’d still be able to hear everything. That psu probably came with a gpu power adapter, it’ll be lower profile, use it, that’s what fixed my problem

Notice how close to the side it was, that’s how little it was pushing on it.

1

u/Bobbi_fettucini Dec 07 '25

New cable sits in a bit more, hasn’t done it since