i have read of a faulty batch of jasper, so i have read these have faulty memory and cause lockups occasionally while playing games.
if you call ms and give them the serial number of the console they can tell you if it was one of the affected consoles but it is rare.
if you do get it replaced by ms they should give you the same type hardware back, i have read that faulty jaspers that were sent back were replaced with jaspers and this should be true as your 150w jasper power supply will only work wih jasper, older machines it wont even plug into and if it did it would cause instability if it even booted.
in the uk if its less than 30 days old you are legally entitled to a replacement from the shop it was bought from and dont have to deal with ms, in those first 30 days you can refuse a refurb/repair and swap for a brand new one (some shops dont play ball but tell them you know your rights and they soon back down)
have a check if you can do that.