User blog:Dragonforce37/Black Ops First Strike Problem - Help!

I have Call of Duty Black Ops version Bles 01031 (Australia/NZ) and bought First Strike via the Playstation store. I've definitely downloaded and installed the correct version (4 times now) and when I put the disc in the screen is blank. I've deleted my game data and saved game data and the disc will still not work. Can someone help me solve the problem please?