Help!!!! xbox live courrupted file(new)?

So i recently just bought a new xbox, i still have my elite so my dad and i can play multi in the same household. We transferd my things from the old one to my new one with the cable, everything was on from my profile, my dads profile was on there so he took it off with a usb and put it back onto the elite. (My info is still on the elite ) we played for two days, i played gta and this chick had a mod and i added her (idk if it helps letting u know tht) and the next day i turn on my xbox, and my profile didnt load, it was all gone then i turned it lff then on and then it recieved all my info bqck, i sighned into my live manually and , great perfet. Then i started tdu, it said i have no saved info in my memory, then i put in gta, says it cant read it, i tried it in my elite. Perfect, we bought this xbox on july3rd and idk y its doing this. It has my friends up, but now its saying that my discs arent working and that therevis no save game, but my gta is still saved? What should i do, should i get anothr xbox and put my info off the elite back on, again. May i mention my profile on the elite is perfect its amazing.

Plz help, thnxx