My computer was shut down one day when I came home. It wouldn't turn back on, and the power supply was dead when I had it checked. I replace it with a 600 watt OCZ game stream unit. Now the computer comes on when you turn it on, but only by using the button on the back. The on/off switch on the front will not work at all....not on, not off. I have lights inside my computer, and they do come on, also the fans work. But the monitor never comes on. There is a green light lit on my cd burner drive, and a red light on the front of the tower. These lights stay on. The computer doesnt' beep when you turn the power on either. I have an Asus A8V-VE motherboard, a AMD Athlon 64fx dual core processor, 1 gig of Ram, and have windows xp pro as the operating system. My system is a home built system of approx. 2 yrs of age. I don't know what happened originally to cause me all this trouble, but would appreciate any help anyone might give. I ordered another MOB thinking this might be the problem, but haven't received it yet to replace it. Thanks again for your help.