My Toshiba satellite picks up my iphone 4, no problem. When I hook up my iphone 3g the computer beeps but doesnt show it anywhere. I took the 3g to a mac store and they plugged it into their computer and bam, there it was. I bought a new cord and tried it on my computer. Same problem- the 4 works and the 3g doesnt.I cant even update my OS. Ive went through the troubleshooter and assistant several time to no avail. Please help.