Basic troubleshooting for a DVD/CD player is to remove power for a few minutes then boot it back up to see if that works. If you still have issues then double check the DVD/CD you're using to make sure it's in good shape and try a different disc to see if that changes anything. If that doesn't then check to make sure your TV and/or speakers are working.
You should also be able to locate a "Reset" button and hold that until the system resets to see if that works.
If none of that works... view full answer...