Demo does not start

Hey guys,

so I downloaded the demo and was really excited to see how the game is. The problem is now, that the demo keeps at the loading screen. There is sound, the loading sign is flashing and in the background there are Lights(?) moving so my PS3 didn't crash. I let my PS3 run for 30 minutes but it still didn't load.

Anyone else had this and knows how to deal with that?

Thanks in advance!