Can someone help you with black ops and solve a problem when i go into a pulic match private match combat training it gets to the end of loading but the game never ever starts the game help

You do not specify what format you are asking about.
For the Xbox 360 & PS3. This should not happen. However, if you are a xbox user, try installing the game onto your hard drive and see if that works. If not, it may be your disk.

For the PC. Install the game again. You will not lose any settings if you are reinstalling the game.

Good luck.