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Make an iPhone work on a 20" iMac G4
Authored by: jdownward on Jul 23, '07 10:57:01AM

In addition to the 20" iMac my wife has at work, at home, we also own a 20" iMac. After upgrading it to 10.4.10 with all the patches installed, iTunes would not recognize her iPhone even though the Apple Profiler showed it was connected to a phantom USB 2.0 port. Again 4 ports were displayed by the System Profiler, but only 3 ports were in the back of the iMac. Proceeding as before, I removed the 2.0 USB driver, reinstalled iTunes, and her iPhone was immediately recognized by iTunes.



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The "phantom" probably isn't the one you think
Authored by: VRic on Jul 23, '07 03:39:58PM

I suppose the USB 2.0 port showing your iPhone really is one of the 3 external ports, and the "phantom" one (internal) actually is one of the others in the list, probably USB 1.1 if the internal modem is present.

Given there's only 2 USB 2.0 controllers shared among the 4 ports (3 external and 1 internal), it may be possible that all appear as USB 1.1 if the internal modem is present and something USB 1.1 like a keyboard is attached to the other controller.

Maybe your problem and solution have more to do with some glitch between USB 1.1 and 2.0 peripherals trying to grab the controller and only succeeding when the only USB 2.0 peripheral reverts itself to USB 1.1 after you killed the USB 2.0 mode on the host.

If you have other USB 1.1 peripherals (keyboard, old USB hub, etc.), try plugging them to another port to free one of the 2 controllers for USB 2.0.



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