Recently Bought Ps3 Slim 160Gb(with CFW 3.55) from a Pg Member, after buying it, i starting downloading GOW 3 it took almost three days but i was successful at downloading 35 Gb GOW 3, i copied it to my external HDD and then copied it to PS3,s internal HDD using Gaia Manager(it took me 30 minutes), now after i installed it, i tried to run it, it shows up in Rogereo Manager and Gaia Manager and in the Main but when in the main whenever i try to run it nothing happens, screem goes black for about 15 or 30 seconds and then it goes back to main screen, every other game(that came with PS3, Uncharterred 2, Fifa 11 etc) runs fine, now what can me the problem??? please Help.