Go into town and buy a 360 from HMV/Currys/PC World etc
Take it home, swap the consoles over, take it back a few hours later saying it doesnt work, you're not happy, you want your money back and you dont want to risk another one.
Then ring Play, tell them its fixed itself somehow.
Lol I hear so many storys of Xboxs blowing up it makes me wonder, are you lot playing them for hours on end or just unlucky.
In this case I think luck is not on your side. Mines been faultless though lol.
thats what happened to my housemate although his was the vga cable not seated correctly, so easy to do and think its just knackered, even if it isn't the power cable it won't power up.I'm so glad I cancelled my order from Play and got mine from GAME (in the highstreet). Mine wouldn't power up when I first got it, figured out it was because of the power cable wasnt plugged in far enough (it hadnt clicked in).
Feel sorry for you mate!