Had motherboard replaced due to no sound and no picture... replaced board and the sound and pic came on....hooked up ps3 and played game dj hero 2 and the problem came back no picture only sound. I reset after disconnecting the ps3 and same problem occurs.

SOURCE: "Lag" during play

Have you tried playing the game with the controller connected to the PS3 via the USB cable? Also, just as a test, DISABLE the Internet connection option on the PS3's menu to see if it makes any difference. I found that for some reason some titles (namely Enchanted Arms) have been know to act erratically with an active Internet connection whilst playing.

SOURCE: wont play ps3 games

I had this problem and it really made me mad. I tried re formatting , reset settings and nothing. Then I tried using some air sprayer that people use on computer key board and I sprayed in where the disc goes and now it works perfectly. Perfectly!

SOURCE: Guitar Hero Guitar not working with Rock Band Equipment PS3

I think that rock bad comes with a special guitar that is for rockband so you cant use the guitar hero guitar on rockband SAD but true. check out ebay for another rockband guitar I had to do the same.. unless we are in the same boat and I was wrong!

SOURCE: PS3 won't even show the menu screen

I suggest trying to reset the system by turing the system off first. ( Do not cut the power switch off in the back of the system). Then hold the on button for 3 beeps. See what happens.

SOURCE: guitar hero world tour game has no sound all

check your disk for scratches or fingerprints.