Game sound not working after update 3.00

Hey guys,

I go to turn on my PS3 and I had an update so I did the update and then I played with my mate (Splitscreen) on Cod WaW, the sound was working then. Then today I trun on the PS3, get signed in to go online, and then I go to play CoD WaW, and when it gets to the introduction (Treyarch and Activision Intro) the sound does not work, I tryed going into multiplayer, but same thing, sound doesent work..

I then turn the PS3 off and see if it will work but nope same thing.. This is the strange thing, I signed out of online and turned on my second controller (the one my mate was using) and the sound works, Weird eh?

So is there anything you guys can do to help so when I go into the game the sound starts up straight away or is it a stuffed up disc? I bought it about 2 weeks ago and it is an Australian Disc (BLUS-30192) That I got of eBay brand new from an online gaming store.. Oh yeah and I tryed CoD 4 and the sound worked fine!

EDIT:It's okay, I left the PS3 for about 6 hours and the game sound works now!

Please help!!! Woofy