I needed to shutdown my computer, a few minutes later I went to turn it back on and it failed to turn on. I noticed that the motherboard lights were on and everything but no fans were running and nothing was turning on. I turned the PSU off and then on. When I pressed the power button and the cpu fan turned on for around a revolution, then shut off. I suspect this means that the PSU is to blame. I have only had this computer since december and I am confused why this happened. I my PSU is a corsair TX850M, case is corsair 650D, CPU is i7 3770k, GPU is Nvidea GTX 660 Ti Sc, and the MB is ASUS P8Z77-V Pro. Thanks to all help.