computer shuts down upon boot up?
usually the power supply will either work or not work. And if it gets through the POST then it is probably not the problem. When you first hit the power button is the point at which the most power is pulled from the supply. I would remove devices one...
pc hardware problem ?
This could be several problems. If the CPU fan is connected to the power supply directly (instead of the motherboard) then it's probably a fried motherboard. If the CPU fan is connected to the motherboard and still getting power, it could mean that t...
My computer isn't turning on... What's going on ?
Try to reseat the internal power cables to the motherboard, and the cables to the power supply. Try a power supply tester to see if the PSU is dead. Try to leave it overnight, in case it had gotten too hot, so all the heat can dissipate. Other than t...