Every time I put in Black Ops 1 in my Xbox 360 and press play, it freezes at the end of the intro when the screen turns white.
It is a used game but there is no scratches or marks on the disk.
You can "bypass" this issue by renting the game and installing it to your Xbox. Once it's installed a faulty disk should work.
Here is the link to install a game to your Xbox: https://support.xbox.com/en-GB/xbox-360/system/install-play-delete-game#1e9bb50361ee488da0cbd0ea72b78d99
It happened to us to and we left it for a couple minutes and then it loaded