It's my first computer build, been bugging for 3 weeks now. Took things out, put things back in, vice versa but it still happens. I turn on my computer, it turns on normally, everything is working fine then 20-25 minutes later the computer turns off by itself. Luckily I managed to create a system image, and installed all the drivers before it crashed. Also, after it turns off, it doesn't turn on again. Here's a more detailed description: The powersw (switch) case connector is put in the correct spot, but when I click the power button from the outside, nothing boots. Sometimes it does boot, other times it doesn't. Also, I use the screwdriver method and I discovered there are two places where the motherboard can boot from. One being the correct spot that it suppose to boot from, the other one is located beside the the case audio connector (I'll give you a visual). From these two spots, one of them will work at times when the other won't. I go back and forth shorting the pins of the two places, which I know is wrong. On the other hand, I did manage to find a faulty RAM stick and I removed it but the problem still occurs. In short, the power button sometimes works other times it doesn't - thus, I open the case and go back and forth. The power supply I got came with the case I purchased, and it was then I realized cases with power supplies are pretty bad. So I bought a new power supply and the same problem occurs. Now I'm stuck on this. My guess is that the problem maybe be the motherboard, but I'm here to listen to more possibilities. Thanks for reading! Here's my build: http://ca.pcpartpicker.com/user/SkyFlashX3/saved/1z55 My new power supply is Corsair CX Series 500W Power Supply by the way.