Computer turns on automatically?
I upgraded my brothers computer about a month ago. It was working normally will a couple of days ago. My brother plugged in the Mic In and Headphones on the front, and the computer turned off. No matter how many times he pressed the power button, it wouldn't turn on. So I went into the back, and flicked the switch on the power supply. Waited a few seconds, and the computer turns on. Now, no matter what, we can't seem to shut down the computer. When we choose shutdown, it does a restart. The only way to turn off the computer is to flick the switch in the back. However, right when we flick the switch back on, the computer turns itself back on without us doing anything.
I don't know what to do, or what's causing it. Any help?
Desktop -Cooler Master NV690/AMD Phenom II X4 965 BE/MSI 880G-E45 Motherboard/2 x 2GB DDR3 G.Skill Ripjaws X/Sapphire HD 5870 1GB GDDR5/CORSAIR CMPSU-550VX/Seagate 7200.12 500GB (OS), Samsung F3 1TB (Storage)/Sony DVD Burner/Windows 7 Professional 64-bit