Once power is plug in at wall outlet, XBox turns on and disc door opens. After a couple of seconds, the door closes and XBox powers down. After about 10 secs., it powers back up...door opens...door closes...powers down. Any suggestions???

did you check for shorts on the eject board and yellow dvd cable like we told you in gen hardware?

Try this link: http://forums.xbox-scene.com/index.php?showtopic=644822

Usually one thread is enough, and you also had answers in that one...