**UPDATE**
I have now attempted, in this order:
-replacing the x-clamp
-RBJtech's fan shroud mod
-pointing a house fan directly at both heatsinks with the unit open (so while a heat issue may have caused the problem, the unit doesn't appear to be overheating)
-reflowing with a heatgun
-overheating using the llama.com method
-swapping DVD drives
and.....every time i get the same results!
The 360 turns on and appears to be operating properly (I haven't had a single rrod, since the initial one months ago), but....rock band freezes almost every song and ace combat freezes every time after a few minutes! There might be more games that would have issues, but these two are the only ones I know of right now.
Yet in the last few days COD 4, DMC 4, NBA 2K8, NHL 08, The Orange Box, Halo 3, Mass Effect and more have all played perfectly without a single freeze. What the hell...
Maybe it's a faulty GPU. I really don't know. I just don't understand why a small handful of games have issues, while a majority of games play fine.
I've never heard of anything like it, and I'm just about done screwing with it. It sucks because I've been able to fix the rrod for everyone else i know who has had it, using an x-clamp fix/cooling upgrades.
All input is much appreciated.
And if you did, did you apply the correct amount(size of a rice grain) of the thermal compound?
Too much or not enough thermal compound can lead to these issues...
The fact that only some games dont work is a bit weird though...