Attempted to upgrade the power supply, but it functioned temporarily before shutting down.
Attempted to upgrade the power supply, but it functioned temporarily before shutting down.
I recently attempted to upgrade my PSU from a CX550 to an RM850x. After connecting everything, it functioned properly for around 40 minutes before shutting off completely. The power indicator remains on, but when I press the power button inside the case, the CPU fan moves slightly before stopping, and no other components activate. This is my first experience with a modular PSU, so I tried rearranging the ports without success. My PC is fairly old, except for the 3080 graphics card I received from a friend for a low cost, which might be struggling with the current setup. After reinstalling the old PSU, everything worked correctly.
Did you install only the cables provided with the new modular PSU?
The fan runs for a moment before stopping, and there are no beeps. I've adjusted the cables several times and they fit well now. I've also changed the ports on the PSU multiple times, but everything works fine. Wouldn't the fan spin briefly and light turn on if it were completely off?
@sonofjesse
"Most PSU don't turn on under light load." – References?
Many devices now feature a quick start design which provides power instantly, as shown by some LEDs. This contrasts with the requirement for a full physical switch that acts as if the device is unplugged. The key difference lies in the fact that "quick start" always uses some wattage, even if minimal, whereas no power is drawn at all.
= = = =
If everything functions properly with older PSUs, the new PSU or its cables might be the issue. Do you have a multimeter and know how to use it? Or do you know someone who does?
FYI:
https://www.lifewire.com/how-to-manually...er-2626158
This isn’t a full test since the PSU isn’t under load. Check both PSUs and look for any voltages that don’t match specifications.
I tested it on another PC just in case it didn't work with mine and produced the same outcome.
I've never used a multimeter before and don't know anyone who does.
It's really surprising it worked for about 40 minutes before stopping. Could I have inserted something incorrectly and caused it to fail? I've seen PSU failures before, but this one still seems to be functioning somewhat.
I could take it back to the store where I bought it and have them test it or possibly exchange it.
It might just have been a simple issue.
Yes: consider returning the PSU. It seems there could still be some warranty coverage.
Attempting anything else on your own might cancel that warranty,
PSUs aren’t meant to be fixed and handling them can be risky.
I returned it and received a replacement, which is functioning perfectly. It seems it was just a faulty item. Thanks for your assistance—I really value your help! 🙏