Tom's Hardware > Forum > CPU & Components > Other Components > Power On a ATX power supply w/o MB?
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cubicl   09-02-2002 at 06:33:48 AM

I just got 2 120mm fans and wanted to power it using an external supply.
So I got my dust covered Pentium 133 box and riped out the power supply.
But the thing just won't power up without connecting it to a MB.
How do i power it up without connecting it to a MB?
I've heard shorting some wires will do the trick, but this is a brandless power supply with no spec sheet...

Thanks.

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Crashman   09-02-2002 at 10:32:01 AM
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Sometimes the two wires you jump together are thinner than the rest.

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germne   09-03-2002 at 05:33:50 AM
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If your sure it is an ATX supply, short pin 14 to pin 15. If it's plugged in and (if it has one) the power switch is on, pin 9 will have 5 volts on it and can be used as a reference when counting pins. Some ATX PSU's will still not turn on if they do not see a load on all the outputs.
I suggest you get a cheapo power supply like the ones used for charging wireless telephones and other stuff. Make sure the voltage is OK for fan.

Regards

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