I have not been able to play Forza 5 for several days now. My game is stuck at the load screen right after opening credits. I press A to start and the little spinning loading symbol just keeps going, I will get the little messages like new DLC and Rival recommendations but then nothing. I have already tried reinstalling the game with the same results. I would have just contacted Turn 10 directly but I guess you guys got so tired of complaints that you no longer have that option now on the website, which is highly annoying.
Game FAQ: Troubleshooting General Steps and ‘How do I contact Turn 10?’
Other users have reported success by resetting the console to factory settings.