its a console you owend and it suddenly started to do this or have you tried to downgrade or install a custom pup. if its a console you got from eBay then maybe they attempted a downgrade on it check to see if the warrenty sticker is intact
no, no, no. my guess is that its a console bought from ebay, if the warrent sticker has been removed. they probaby attempted a downgrade and bricked it. but it could be a number of things.. its not a faulty power supply, there would be no power at all!