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If the fan that is working is the outside fan on the power supply and if your case is well ventillated there wont be a problem. If not then buy a new power supply.
Presuming you mean the Earthwatts 500:
Should work, though the Earthwatts has the 24 pin ATX instead of the 20-pin.
http://www.atxpowersupplies.com/manuals/Antec-Earthwatts-EA-500D-user-manual.pdf
You just need to snap the 24-pin connector apart to make it work as a 20-pin. It can be snapped back together for future motherboards.
The Bestec is just a standard ATX power supply
Out university has hhad a failure rate on antec 450w psu of 40-50% over 4 years (total number of pc:s with this psu was approx. 300). Check your motherboard with a known-to-be-good power supply.
If you have another supply around, you can remove the connections from the M/B ( 20 or 24 pin ) and a 4 pin 12 v connector. unplug the peripherals if you want. Carefully plug the new 20 or 24 pin conn from new supply into M/B and the 4 pin 12 v.If fans spin and there's no smell...sucess remove old and plug in new.
1. Check that the cpu fan is properly connected to the correct port marked CPU FAN.
2. Make sure the power cables are connected correctly to the motherboard.
3. Test the button switch with a multi-tester to make sure that it tests good.
4. Make sure the power switch is connected to the correct pins on the motherboard.
5. With the computer off pop the cr2032 battery out and pop it back in after a few minutes.
6. Test the power supply with either another motherboard or a power supply tester.
7. Test the motherboard with another power supply.
8. If all else fails replace the motherboard I have had a bad one from time to time even out of the box, and if you have a spare cpu you may want to test with that also. Cpu's hardly ever go bad I think I have had two go bad ever, not counting power surges and storm damage.
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