I walked away from my computer for about 10, 15 minutes today. When I came back, it wouldn't start up. I moved the mouse around, nothing. I tapped the key on the keyboard, still nothing. I even press the the power button on the tower and still no change. I turned the power supply off and then on again. The fans were running, but that was all that happened. No beeps, nothing on the monitor, nothing but the fans. Is there any way to fix this?