I just received my RGH'd console yesterday and download CoD4 and CoD: MW2, and neither want to work in system link. If I start the game through XeXmenu, I get a black screen until I sign out of the profile, after that, everything works 100%, except system link. It keeps telling me I need to be signing into a profile, but if I sign in, it goes to a black screen until I sign out again. MW3 Doesn't have this problem, however. Also, on MW2, when I sign into the profile it keeps flashing some thing like "Connection to XBL has been interrupted." and I can't do anything until I sign out. Also, my console is connected to my retail through an ethernet cable, and the retail goes on XBL with a wireless adapter. My RGH is in no way, shape, or form touching XBL.