I have a older computer, w/ASUS P4b266-LA motherboard, it has a green light on it. Recently, my mouse, and keyboard went out. Try to turn computer on and my cd rom drive had a steady light. Dissconnect using the power supply plug, wait at least 7 min. Turn computer back on, dont hear the hard drive booting nor the a: drive trying to work. What could be the problem. Mother boards lights up mouse and keyboard do not respond. Monitor is blank. Please help!!!