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The 20" iMac G4 DOES have USB 2.0
Authored by: VRic on Jul 23, '07 03:19:46PM

As patgmac wrote earlier, this iMac model has USB 2.0. And to be exhaustive, all 3 sizes of the last version of the iMac G4 do (those are the september 2003 15" 1.0GHz, 17" 1.25 GHz and 20" 1.25 GHz).

Or in other words, all the > 1GHz iMac G4s have USB 2.0, except the earlier 1.0 GHz 17" (the sept 2003 17" being 1.25 GHz, not 1.0GHz).

Now you know which eBay auction to pick :-)

As for the "phantom" port and occasional USB 1.1 mode, I'm not sure but the internal USB modem port hypothesis sounds mighty convincing. I can't check right now, but I'd expect to find either a 4th USB port with the internal modem on it, or no modem but still a 4th empty USB port.

What I'd like to know if someone has one to test, is if the ports appear as USB1 or 2, or only some of them, or if it depends on the peripherals connected to them, etc.

If as suggested one of the external ports is gagged to USB 1.1 speed by the internal modem, I'd like to know which one it is to plug any USB 1 peripheral and the keyboard there, instead of wasting the others' potential. And if it is the modem causing USB 1 mode, maybe the absence or removal of the modem would revert all 3 external ports to USB 2.

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The 20" iMac G4 DOES have USB 2.0
Authored by: jdownward on Jul 23, '07 04:19:37PM

To clarify, non-synching is not related to which USB port the iPhone is plugged in to (two iPhones have been tried). As the iPhone USB connecter is moved from physical port to physical USB port on the iMac, the location of the phantom 4th USB 2.0 port in the System Profiler listing moves around and while the iPhone is seen by the System Profiler as a 2.0 device attached to the phantom 4th (non physical port) USB 2.0 port, the presence of the iPhone is not seen by iTunes.

The combination of removing the 2.0 USB driver and reinstalling iTunes appears to enable the iPhone to Synch with the iMac G4. It correctly appears on a physical port whose location switches as the USB connnector is placed into different USB connectors on the back of the iMac. Perhaps just reinstalling iTunes would do that by itself.

However, I do know that a fresh install of 10.4.10 and iTunes 7.3.1 by itself will not enable iTunes to see the iPhone on either of the 20" iMac G4s (purchased 6 months apart) that we use at home or at work. If this iMac model indeed has a USB 2.0 port, on at least these iMacs, the port does not allow iPhones to sync with iTunes. A sample space of 2 certainly, however, does not rule out the possibility that iTunes 7.3.1 running on other OS X 10.4.10 20" iMac G4s will synch perfectly with every iPhone they see. Just not ours.

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