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The steps I would take would be :
1 make sure you have a power supply with the proper power connections and at least 500 Watts
2 remove and reset the power connections, try to boot
3 disconnect all hard drives and cd/dvd's, try to boot
4 remove all ram/memory sticks, try to boot and listen for the beep or beeps
if it doesn't beep and still shuts off, you have a bad motherboard and/or cpu
if it does beep, you need to try different ram
Go to to eBay and search for "Computer 20 / 24 Pin PSU ATX SATA HDD PC Power Supply Tester". costs less than $10 USD, It will verify the PS unit is good, then you can determine if there is a problem with the motherboard. Bad PS is most likely the source of start problems for PC motherboards.
first make sure your ac cable is working well, then try to check the power supply of your computer if the fan rotates every time you hit the power button of your cpu, if not then change your power supply. if it fan rotates and stops, try to used another power supply if fan rotates and still won't display open up your cpu try to check if the fan over the processor will rotate and still don't recieve display. try to remove the video card and memory and clean it and re insert it. if still don't work. you got your motherboard defective.
check ur mother board power supply check the FET check all the power lines from the smpswith respective of ground with any line short check which component is primerly conected to that line replace it check the FET power IC etc