Error code E74

They tell you to try everything except what will fix it.
Then they tell you to send it in , and what you get back
my be no better then what you sent in. That's what im
hearing , if its under warranty send it in NOW before
the box does something that isn't under warranty.

oh ya its the G.P.U. de-laminating from the mother board.
proper clamping will eliminate most if not all problems
I know i have boxes that are 3+ years old fix 2 years ago
still going

The code is a general hardware failure which needs to be repaired by microsoft so you need to send it back for them to fix it for you.

Check out this forum, they explain what all the error codes stand for but more importantly then explain what to try and do with the e74 error code:

http://forums.xbox-scene.com/index.php?showtopic=484726