Having problems with your HP Pavilion a1630n PC Desktop ?

Power turns on then immediately off

\015 I have a P4 system I have built. I have bought a new atx power supply to put in an older case. With everything installed, the power goes on, then turns off. Fans spin then turn off. There is a green led on the mainboard that is on, indicating to me that there is power going to the board. Is it possible that an older PII/PIII case (I say case only with its on off and reset buttons) cant accomodate the off/on for an newer ATX style motherboard? Any ideas?\015

Answers :

The case shouldn't have anything to do with power getting to the motherboard. Though there should be a switch on the power supply to increase or decrease the voltage move the switch to the other position and see if the machine stays on.
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