I recently purchased a Playstation 3 (60 gig) system. When I first brought it home, I tested it with Guitar Hero II. It worked.:)
Next I purchased ROck Band. It said it had to update in order to use the disc. So I updated the system.
Now it no longer plays Guitar Hero II. :(
Can I get Playstation 3 to accept both Rock Band and Guitar Hero II?
How?
Thanks for your help.:)

That doesn't make sense... ps3 and xbox don't update thereself for playing a game... u put the disk in it and it plays it... its not a PC.. no need t be updated

There is a problem with the latest firmware update:
Technology News: Gaming: Sony Pulls Update Following PS3 Firmware Fiasco
Perhaps that is what is affecting you.

Really your problem is that when you up date it it has to specificly ps3 games I had that problem to but mine kept freezing when I put a ps2 game in so I stopped putting ps2 games and only put in ps3 game