My computer doesnt turn on all the time. I was using it and I had left it on over night. When I woke up my power supply was making some odd noises. I ordered a new power supply and got some ram while I was at it. The computer was still working with the old power supply it was some 450W power supply that came with the case it just kept making noises. I plugged in the new power supply a 580W Black Steel and the ram. Now the computer barely turns on. I have to press the power button then cut the power 10-15 times to get it to turn and some days it will not turn on no matter what. When it does manage to turn on everything is fine it doesnt crash its fast. I tried putting the only power supply back in and still does it. The motherboard is a PCChips A11G V1.0 its Socket Amd Am2. If you have any idea as to what would be causing it not to start please let me know.