Hey guys, I was listening to music in iTunes and I heard a pop from my speakers and then there was no sound at all, even though a song was still playing. I tried to play other songs in iTunes but there was no sound so I restarted iTunes and clicked on a different song, heard another pop and the music came back again. Any idea what caused this to happen? The log files reveal nothing apart from this in the console.log - "missing or invalid cross-reference stream." Not sure if it's even relevant. Any help would be much appreciated! I've had the computer for about 3 months and this is the only time that this problem has happened. Disk utility gives this ominous message - Verifying volume Macintosh HD Checking HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Incorrect block count for file _CACHE_003_ (It should be 43 instead of 47) Checking multi-linked files. Checking multi-linked files. ,"Checking Catalog hierarchy.",0) Checking Extended Attributes file. Checking volume bitmap. Checking volume information. The volume The volume ntosh HD needs to be repaired. Error: The underlying task reported failure on exit 1 HFS volume checked Volume needs repair Note how it says "The volume The Volume ntosh HD needs to be repaired" That's the actual message it gave me. So, I tried disk utility again a few minutes later and it now tells me that the Volume passed verification. I have also verified my permissions but it didn't tell me what it had fixed this time, it just said permissions had been repaired. When this happened I was in a chatroom that used flash on Firefox. Not sure if this maybe have caused the problem. I recently registered with Apple Care, maybe it's time to run Tech Tool Deluxe?