Hey everyone! I'm running into a weird issue with my new Corsair RM750x (2021) power supply. When I try to power on my PC, nothing happens—no sounds, no lights, no fans spinning. The odd thing is that my old generic PSU works just fine, so I know the motherboard, CPU, and power button are all good. Here's my setup:
- Motherboard: ASRock B450M-HDV
- CPU: AMD Ryzen 5 5600G (using integrated graphics, no dedicated GPU)
- RAM: 2x16GB DDR4 3200 MHz
- SSD: 500GB NVMe M.2
- The new PSU is a Corsair RM750x 80+ Gold (2021)
- Case: Generic, and power button is confirmed working
I've already tried a bunch of things like double-checking all the power connections, using different outlets, jump-starting the PSU which seems to work just fine, removing non-essential components, and even building the system outside the case to avoid any grounding issues. The PSU fan briefly spins but then stops, which I think is due to its Zero RPM mode.
So I'm stuck here wondering if the Corsair PSU is just faulty, if there's a compatibility issue, or if maybe I'm missing something important. Has anyone experienced something similar or have any ideas? I'd really appreciate any help!
3 Answers
Hey! It sounds like your RM750x might be having some issues. Did you use any of the cables from your old PSU with the new one? Sometimes PSU cables can be non-compatible even if they fit. Just double-check the connections and see if you're using the original cables that came with the RM750x, as mixing them up can cause problems.
I had a similar issue once, and it turned out that my PSU was just broken right out of the box. Since you've already tried the paperclip test and it worked, it could be that your motherboard isn't drawing enough power to activate the Corsair’s protections. Some PSUs won't turn on if they sense a load below a certain threshold. You might want to check if there's a compatibility issue or consider replacing the PSU.
Yep, I agree! It seems like isolating it down to just the motherboard and CPU, then still having no power suggests the PSU could be faulty. You could also try testing a different outlet or power strip just to be sure, but if it works with your old PSU, there's a good chance the new one is the culprit.
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