Hey folks, I'm having a tough time getting my PC to boot after replacing the power supply unit (PSU). Here are my specs: AMD Ryzen 9 5900X CPU, MSI X470 Gaming Pro motherboard, Gainward RTX 3060 Ti GPU, and 16GB of Corsair DDR4 RAM. My old PSU was a Gigabyte P650B, which failed suddenly under load, causing shutdowns and loud fan noise. I switched to a be quiet! Straight Power 12 750W 80+ Platinum PSU, but now the system shows no signs of life—no POST, no fans spinning, and no lights on the motherboard.
I've checked that the PSU switch is on, the power cable is plugged in, and all connections (like the 24-pin ATX and CPU power) are secure. The motherboard debug LEDs aren't lighting up at all, so I suspect a lack of standby power. I haven't tried stripping the system down to just one RAM stick and no GPU yet.
Could the original PSU failure have damaged the motherboard? Or is there something obvious that I'm overlooking? Any advice would be greatly appreciated!
3 Answers
Yeah, if your old PSU was malfunctioning, it’s definitely possible it took out the motherboard. I recommend researching a bit about known issues with the brand to see if this is common. Also, make sure to test each component individually if you can—sometimes just one faulty part can cause everything else to fail.
Have you checked if you're using the correct power cables with the new PSU? You can't mix and match cables between different PSUs. If you have used the right ones, it sounds like stripping it down to the bare essentials is a smart move. Also, double-check to make sure the PSU is switched on and set to the right voltage input—sometimes that can cause issues too.
When a PSU fails, it can definitely take out other components with it, especially if it was a lower quality model. Given that your new PSU isn't showing any signs of power, there's a good chance that the old PSU damaged your motherboard. You might need to try swapping out the motherboard if you can find a replacement to test. Just be cautious—if your CPU or GPU were damaged too, they could potentially harm the new motherboard.
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