my xbox 1 i have i got it off my mate, broken, i pulled it apart and it turned out the power supply in it had fried, like th capaciters were burnt, i just chucked a new power suplly in for like 50 bucks and walla xbox!!
but yea havent had any problems since with my number one
also i heard that the first gen of the 360 was the faulty ones, so if you bought a current new one it should be fine :wink:
just so that we all don't think to not get a 360 as so many cases of them being broken :hmm: