QUOTE(hairball_grfx @ Nov 9 2006, 10:25 PM)

Thanks for the response, actually I think I figured it out. I had Tron UMD inserted and it wasn't working but when I decided to dump another game (PacManWorld3) and it didn't work with Tron I put in the PacMan UMD and was able to start up DeathJr. So it must be something with the movie disc. Any advise on what could be causing this conflict?
From what you have said, it sounds like you need a game UMD (not a movie UMD) inserted for an ISO to work.
I don't have a movie UMD so I can't confirm this, but it does make some sense.
If you're using 2.71 SE-B3, you can set it to NO-UMD mode using the Recovery Menu (hold R on boot), which should make it work whichever UMD (or none) is inserted.