okay. my tivo started acting wierd, so I rebooted it, now it wont boot anymore..

welcome starting up screen,
green light flashes once. then amber light flashes a bit, then screen goes blank and tv says no signal. hd doesnt seem to be accessed. but it is spinning. tried to access the 5x menu. nothing happens. when I enter the code. the green and amber light flashes alternately for a bit, and then after that it goes blank screen an no signal. please help!