HP Pavillion approximately two years old, Vista, Intel VIIV, Nvidia graphics card. Dont know the rest off the top of my head. Power light and fans come on. No audio or video input received on monitor. No processing light on tower. You can still open the CD drive. Got up this morning, the power light was orange like when its on standby or hibernating. Pressed a key to the keyboard to wake it up, nothing. Held the power button to shut it down and wouldnt come back on.