Hello, I have a SR MBP 2.4 ghz and I would occasionally get that anoyong "pop" from the speakers. I installed the sound driver update from apple and I still get the pop, but I also get a very loud tone (lasts a few seconds) that has happened on several occasions. It almost sounds like an alarm or something. It is not reproducible, and it doesn't happen all that often, but when it does it is really loud and startling. Anyone else have this problem?