I recently purchased a PC from someone on a marketplace, and I didn't do much checking before buying. The specs looked good from the pictures, but now I'm experiencing issues. When I try to play games like Fortnite or Arc Raiders, the GPU tends to overload and the system just shuts down completely. However, when I'm just using it for school or personal tasks, everything runs smoothly. I have updated the OS, but I'm really confused about this random shutdown issue during gaming. Here are my specs: GPU: AMD Radeon RX 580, CPU: AMD Ryzen 5 5600X.
4 Answers
Have you seen any error messages when it shuts down? Sometimes, that gives a clue as to what's going wrong. Or does it just go black screen and turn off?
Random shutdowns are usually linked to power supply problems. Do you know the model of your power supply unit (PSU)? It could be struggling to provide enough power during gaming sessions.
Trust me, I’ve had similar issues. It sounds like it could be your PSU if it's a cheaper brand. Just because it's 850 watts doesn't mean it's good quality; sometimes, generic PSUs don't handle gaming demands well.
Try using Event Viewer. Search for it in Windows, and check under Windows Logs and System to look for warnings or errors around the times your PC shuts off. You might find some event IDs there that can help diagnose what's up with your setup.

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