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Power Supply Working Outside of Case, No Power In Case

Discussion in 'Hardware' started by lukewcfc, Jul 16, 2019.

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  1. lukewcfc

    lukewcfc Thread Starter

    Jul 16, 2019
    I have two systems, an Optiplex 790 and another PC with a A68HM-Plus board and a A8-7690k. The power supply that came with that system (bit of a scrapyard wars build) is working fine now, computer is booted up as I type this. However, I'm having an issue with my Optiplex system that I've not had since I bought it over a year ago now. That system has had a CIT Active 550 watt PSU in for just over a year when I bought a graphics card for it and everything was running fine. I then bought the A8 system and wanted to swap the graphics cards, meaning I needed to swap to a different power supply as it did not have a 6pin connector on it. No problem, swapped PSU. The problem is that it is all very tempremental. The power supply has worked outside of the case, but is not working inside the case. Just to clarify, it is not always working outside of the case either. So I bought another PSU, a Corsair 500w PSU because I assumed the problem was with the PSU. This also has the same problem, where it occasionally works outside of the case, but never when it is installed in the Optiplex 790 case. I reseated the RAM and that got the system working with both the CIT and Corsair power supplies, but only outside of the case. Could something in the case be shorting out both power supplies when installed in the chassis?

    I'm at a complete loss, if you have any other questions (which I'm sure you will as I've explained this terribly) please feel free to ask.
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