3.0 update problems iPhone 3G

I have the iphone 3g and I recently updated to the 3.0 software and alot of times throughout the day the message pops up that says that this device doesnt work with the iphone and asks if I want to turn on the airplane mood ( I do not have anything plugged into the phone). I also noticed today that when I play my music that there is no sound coming from the speakers ( I dont have headphone plugged in I was just trying to hear it through the phone speakers like I could beofre). It also doesnt show the volume bar. Please help. Thanks
Ibook g3 Mac OS X (10.4.11)