How come the iPod Touch doesn't charge when connected to an USB extension?

I have it plug it directly into the iMac, I can't plug it into an extension cable connected to the iMac. My older iPod Touch charged just fine using the USB extender, but my new one refuses to charge unless it's directly connected to the iMac. Why would Apple change how the iPod charges? Those extension cables are useful when you need to switch out USB devices, since the ports are all in the back of the unit.

I noticed the same thing happened with my iPod touch. It wouldn't charge on my iMac but when I connected it to my Macbook it started up right away. The difference being, I think, is not the computers but the usb hubs. The one on my Macbook has its own power supply where as the one on my iMac doesn't. Try that. Maybe the usb hub just needs to have its own power supply in order for the iPod touch to charge. So if that's the case then the usb extension cable probably won't work at all.
Message was edited by: B.C. Drummin
Message was edited by: B.C. Drummin

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