None of my games are working, they all say unreadable disc. I bought a new game to see if it was the xbox and it said unreadable disc as well what do i do?

Sounds like a DVD drive failure, which is not uncommon in the first or even second generation xbox 360's

if it's out of warranty take apart the xbox and replace the drive. if it's not call Microsoft and get it repaired

# Turn console off and then on. # Clean the disc and examine it for flaws or scratches. # If this behavior occurs with one or two discs, search the Microsoft Knowledge Base for the specific game title(s). If you find a known problem, follow the information outlined in the article. # Delete the appropriate saved games. See Note 1. Copy a saved game to a Memory Unit (MU) if you have one available. # Try three other games, and then try the original game again. # Try the game on another console if possible. # Replace the disc at retailer. # Repair the console Note 1 If a saved game file is corrupted, it can produce a disk error message in that game, particularly when the game starts. You can resolve this issue by deleting all saved game files for the affected game from the Xbox hard disk. This method is effective approximately twenty-five percent of the time. If you experience this disk error message with more than two games, this procedure will likely not resolve the issue. Another trick to try is to turn your console so its vertical( sometimes works)