I just bought a modded 4GB X-BOX slim recently. I was able to play all of the games until I updated my X-Box LIVE as I just purchased the whole new set of Guitar Hero band set with an original disc and would like to try the online feature of it. After I updated it, I was unable to play HALO:Reach (pirated) which I can before. The console can't read the CD and I need to turn my console off/on to remove the CD as it get stuck  in it. Others pirated games seems to be working just fine. The HALO CD tested fine when I took it back to the shop for an exchange. I have consulted few shops but they can't seem to be able to sort my problem out. So, I was hoping that maybe some of you here have the answer to this problem which I believed is related to the X-Box LIVE updates and hoping that there is a solution to it as I really wanted to play HALO:REACH. Thanks.