Sorry if this has been posted and answered before but I have 2 concerns that have to do with my iMac. First one: My built in speakers aren't working. I'm guessing it has something to do with the speakers jack because there is a red ring around it. I tried googling how to fix it but nothing seems to work. Second I'm running OS version 10.4 Tiger and I can't seem to find OS 10.5 anywhere to upgrade. I know that Snow Leopard 10.6 is available, could I just install that skipping 10.5? I kind of just want answers here before I actually have to go and wait in the endless line at the apple store. All your help is appreciated!