Running PSU without MB attatched?

lazyboy

Senior member
Dec 22, 2000
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I want to test some fans for airflow and what not. How can I do that with just the PS and fans in my box. The fans have molex connectors.
 

flippinfleck

Golden Member
Oct 24, 2000
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May not apply here, but I have a 100w psu that I leave in the corner of my room just for testing sheet. Works pretty good for not being plugged in to a mobo :) Hope it works for ya.
 

Asha'man

Senior member
Oct 15, 1999
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If it is a ATX PSU I'm pretty sure you need a mobo to start her up.

If you have an old AT PSU you can start without mobo

Asha'man
 

GiZzO

Golden Member
Nov 6, 1999
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You can power up the Power supply without a MB.

All ya gotta do is have the PS-ON connected to any of the ground wires.
PS-on should be a green wire, from the ATX connector just have wire going from PS-ON to a black one thats a ground wire.
 

GiZzO

Golden Member
Nov 6, 1999
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The one thats labeled PS-ON...yep and theres 7 ground wires

edit: my power supply only has 1 green wire sure your not mixing it with the blue wire?
...lemme find a diagram