Installed update 4.30 and system would no longer recognize game disc. Seems to constantly 'seek' when game disc put in, tries to eject and retry, then just stalls out. Tried with several games. Plays blu-ray movies just fine. All other functions work just fine. Installed 4.31 this morning and no change.
Do not read just anything, after update. Problem solved.
The problem was the same update in the newest version fireware 4.31 PSN. I downloaded another version to put European 4:31, and it worked just right.
Serve it up for you, to solve this same problem with other clients in the same situation. I was reading the forums, and unfortunately this occurring with this new fireware 4.31. I hope I helped, and I'm happier too.