I recently got a Corsair CX 750M PSU to replace my old EVGA PSU. It clearly supplies power to the motherboard due to the RGB lights coming on, but my PC refuses to start up.
Attempts to fix- I have replaced the new Corsair PSU with the old EVGA PSU, and everything turned on properly and I had no issues doing anything. And yes, I am using the cables that come with both and not interchanging them.
I have tested the Corsair PSU with the paper clip test, and it runs perfectly fine, so obviously it’s not a PSU issue.
I have removed the battery from the MOBO to clear the CMOS to no effect. I’m at a loss.
I’ve read that it could be a BIOS issue, but surely that shouldn’t be the case as I have a ROG BIOS from 2022 running right now, so it’s certainly not out of date. Any advice?
PC Specs
CPU- Ryzen 7 5700G
MOBO- Asus Rog B 550-F
GPU-Nvidia 4060 OC
RAM- 2x8 GB
Old PSU- EVGA 750 Watt
New PSU- Corsair CX 750why are you replacing the power supply this is very important.
. Did your old one die? If you think it does and are replacing it with a new one that also doesn’t work - tha. It’s likely NOT a power supply issue refusing to turn your PC on. And a new one can’t fix what wasn’t broken.
If you bought a new one just because you felt like it or are getting a bigger video card - confirm the system still boots with the old psu for laughs.
Once you’ve done that install the new power supply. It’s common to just miss a cable or two when securing and this act of booting old psu confirms all the hardware still works and reinstalling new one reseats every cable from scratch.
Good luck.