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Dual PSU's

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I've used up all the connetors on my 400 watt psu and i want to add about 5 fans to my case all that use 4 pin connectors so i want to use an old 300 watt psu i have laying around just to power the fans, so i dont have to to use a splitter to give me more connectors and maybe damage my 400 psu ,my question is how do i rig up the 300 watt psu so that when i turn on my computer both psu's fire up?
thanks in advance