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Thread: Turning on PSU w/out mobo

  1. #1
    ATX Mental Case
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    Default Turning on PSU w/out mobo

    I posted a question to the PSU thread that i now notice i should have probably posted here :p I did some more research and found out that to turn the PSU without a mobo all i need to do is jump the connection between the GRN power on pin with any of the BLK GND pins on the ATX 24-pin connector. My question now being whether i could simply wire in a switch to the two pins and control the on/off with that switch? it seems like it should work but i want to make sure so i don't fry a brand new PSU. lol
    where are you?

    fact: different = abnormal
    observation: everyone is different, therefore everyone is abnormal
    conclusion: there is no normal, express yourself

  2. #2
    ATX Mental Case
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    Default Re: Turning on PSU w/out mobo

    that would work, though i would recomend finding out what the other connections do because in order to keep it on for long periods of time you may have to make other connections.

  3. #3
    Case Wizard
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    Default Re: Turning on PSU w/out mobo

    Yes that would work. (Non-monitary switch)

    You will need a slight load on the PSU (Ie a Fan plugged in to it).


    I did it with my spider project when I had the shell out side for Halloween. (Look at the last part of my work log to see what I did)

    Computer use a Momentary Switch and the computer keeps the conection between the Green and Ground alive while the computer is on. For what you are doing you will need a non-momentary swtich as the switch will need to keep the conections open on the PSU. standard Toggle switch should work rated at least 10A

  4. #4
    ATX Mental Case
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    Default Re: Turning on PSU w/out mobo

    this would be for short periods of time just to test out lighting and motor setups for the cases that i'm working on.


    thanks for the help guys! i really appreciate it!!
    where are you?

    fact: different = abnormal
    observation: everyone is different, therefore everyone is abnormal
    conclusion: there is no normal, express yourself

  5. #5
    Average Rocket Scientist Aero's Avatar
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    Default Re: Turning on PSU w/out mobo

    yep it works, that how tech support wanted me to test my PSU when it fried. "Take a paper clip and stick it in the green plug". Lol, thought he was crazy at the time, but now thats how I set up fans and stuff :p

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