hi guys,

i had a problem as my computer was switched off suddenly.after all the checkings i found that 12v atx power connector on mother board is not functioning.

case1: i tried connected both the 20pin and 12vatx pin and try switching on power nothing moves

case2: i tries connecting only 20pin on motherboard the power comes and fan on the proccesor starts moving. but if i connect both the pins on motherboard nothing is happening

so can anyone please tell me what is the problem and what i have to replace.[/LIST]

you're PSU might have blown.. Replace that first.

If its a crappy generic PSU, then it could have taken more than just itself out when your power cut.

ya idid replace the power supply unit
but still the same problem

Does it speed up to full RPM? Or does it just flutter a bit and die, with power still being applied?

If it just flutters thats a good indication of a blown motherboard or melted cpu, which is a whole 'nother mess of problems.