QUOTE(jvhax0r @ Jul 6 2012, 06:20 PM)
ive read about deleting some cache
....and? Did you clear the cache and the X, Y and Z partitions?
Did you rip the games to the hard drive using DVD2Xbox, or simply copy them across? You should always rip them from a DVD using DVD2Xbox, because it patches the xbe file to allow it to run from the hard drive.
You don't say which dash you are running, but try running UnleashX, and launching the game by pressing the white controller button then run the game as NTSC, then PAL, see if either of those works.