Re: The power supply works and powers the board, but not...
I ws hvin the same problem with the same config and atx 500wtts after replacing smps for nearly 4 times even new i used to face same problem later they tell me that i should should replace my faulty motherboard which was causin me the problem
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if it sparked then something inside the power supply malfunctioned and that is the reason it wont work. You will need to replace it. Unlikely that it fried your board in the process. You can test this by swapping the power supply with one that you know works.
check all your ground screws on the motherboard. If that doesn't work try booting it up with out the hard drive. if that doesn't work, pop out the BIOS battery and unplug your computer, let it sit for about a min. and put the battery back in and restart.
well if u want see your fans working without connecting the power supply you can short the green wire (pin) with any ground (black) to see your fan work.....
use a pin or a piece of mettal to short green and black pins
sounds like your power supplie has not been switched on by *********** board.the fan will not turn on until power supplie is turned on by mb.as far as what is wrong there are several things i can think of.i would try resetting bios. It sounds like your power supplie is working and your motherboard could have a short.but i have no way to be sure without testing. I can however tell you how to perform a test on your power supplie.unplug the 20 or 24 pin connector from your mb. look for a green wire,and then locate the grey one.short these two together(you can use a paper clip or something).if it dosnt power up. your power supplie is bad.also do not short any other wires,and only touch the grey and green for a few seconds as this is not how it was intended to be powered on.
as i think ur processor over heated. or processor can dos not work fine or heat sink not installed properly. remove heat sink, and use heat sink component (a whithe colour gel. u can buy it any computer accessories shop) use it top of ur processor then attached heat sink. and connect processor fan. before installing heat sink check processor fan. then cleare CMOS by removeing battery (because this problem also can happen wrong frequency setting in CMOS setting).