It is a simple explanation, properitary computer companies use different psu's and such than standards. eMachines definitely doesnt use ATX in your example.
You could get a 20-pin ATX PSU for the case. Make sure your motherboard is ATX, and as far as the pins go, one should be to power on, one should be for the LED light, I believe.
Never try to switch cases with properitary comp companies, they mod crap to make you angry!
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