PSU not powering on

By tahirahmed
Dec 29, 2008
  1. Some one please help me with this


    I have a really old PC AT power supply which does not have a hard power on/off switch, It is an old supply with PS1 and PS2 connectors. I want to use this supply as a secondary supply for my system to power up some fans and extra stuff but I don't know where or how to start with. The system with which I want to use this supply is an ATX power supply system.

    Whenever I connect this AT supply with 220v power cable it does not power on (The fan does not move). I have also tried connecting dummy loads like two old hard drives but it does not power on. The PSU is not faulty but it is not power on even with load. Tell me what should I do ?
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    All ATX power supplies need a 3volt connection to the motherboard to power on
  3. raybay

    raybay TS Evangelist Posts: 7,241   +10

    You are tripping down the wrong path, with ideas that do not make sense in computer engineers.
    Just get a better power supply with extra cables and splitters. That may help you avoid putting something to ruin. AT power supplies are such ancient technology, going back 18 years, that there is little you can learn from them, or that will help in any realistic way. They came from the day when the voltage zipped up and down for no good reason for sometimes very damaging effects.
    When you know enough technology to understand how it all works, then you can mess with it.
    Still, if you decide to try it, we would be curious to learn from what you did, and the fun you had.
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