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First, you need to verify that the powersupply is functional. I would first test or replace the powersupply.
Once the powersupply is verified to be working. I will visit the power switch on the case to ensure that the switch is functioning. The can be eliminated by shorting out the ATX pin on the motherboard jumping the system into power-on mode.
If you are not a little techie, this one might be for the experienced.
the p2 connector is for monitoring purposes i believe in regards to the powersupply fan, it isnt a requirement to plug in, in this regard but if it boots fine with out the connector then the possibility is there that you might be looking at getting a new powersupply eventually.
Your best bet is to take the power supply out and take it to a good electronics store that has decent computer hardware. That way, you can compare the connections available and also its mounting style to make sure it will work.
the best thing when you can't see power going through your computer is
1. check the obvious once again (the current setting in the back of the ps.. is it 115??
2. replace the powersupply for known good powersupply.. if it works, your powersupply is defective (likely) if it doesn't your motherboard (unlikely), your memory (likely) or your cpu (unlikely) maybe the one defective.
ya definetely....i will help u out in solving the problem.
first of all open the side cover of the cabinet.....here i am first instructing you how to check the power supply in the system..
as soon as you open the side cover of the cabinet the remove all the wires coming to the motherboard from the powersupply.then there u can see a 20 pin connector coming to the motherboard from the powersupply.in that bunch of 20 wires shot the green colour wire and the black colour wire...and give the power to the powersupply. if its ok and the fan of the powersupply is working then the smps is ok other wise u need to get it repaired by giving it for chiplevel servicing.....
if powersupply is ok then check whether there are any burns on motherboard if so and even if not u need to give the motherboard for chiplevel servicing.....