Originally Posted by evilsperm
I've got a launch 60gb jap ps3 aswell, but i don't update the FW right away and didnt get MW2 until christmas, so i skipped from 2.7 to 3.15 before playing it and haven't had any issues at all. I heard people had been having issues with FW 3.0, and sony released FW 3.01 two weeks later...
Shortly after its release, a very small number of users complained that the system update caused their systems' blu-ray drive to malfunction.
"SCEA is aware of reports that PS3 owners are experiencing isolated issues with their PS3 system since installing the most recent system software update (v3.00),"
MW2 was released Nov 10th and sony released FW 3.10 nine days later, so what I'm suggesting is that it probably wasn't MW2 itself but the FW update users would have had to install to go online to play MW2.
Unless someone wasn't bothered about playing MW2 online and their PS3 wasn't connected to the interenet so they didnt need to update and they still got the YLOD then it would be fair to suggest it was the game itself.