How Come My iPhone 3G No Longer Shows Up Nor Charges in iTunes??

All of a sudden my iPhone 3G doesn't show up in the iTunes sidebar on my 20" iMac, but using the same cable, it does on my MacBook's iTunes. I have tried plugging it in directly to the iMac as well as to my Belkin hub, but it no longer shows up in iTunes, nor does it charge when plugged it. The iPhone stays dark when first plugged into the iMac now. I have restarted the iMac a few times, I have powered the iPhone on and off, and I have reset the iPhone more than once....... all with no change. However, the iPod now does show in the sidebar and on the Desktop, and it charges now after the iMac restarts were done. All the software is updated on both computers and on the iPhone 3G. Does anyone have any other suggestions to try. The iPhone 3G works in every other way as usual.
Thanks for your help!

hi John, i have my doubt that it has something to do with authorization/deauthorization. I have read somewhere before that the iPhone (not sure about iPod) can only be "paired" with one mac and if you want to synch it with another one, you need to deauthorize the initial one first. Inside iTune up on its menu bar under Store, there are 2 options that said authorize and deauthorize. Now i haven't tried this before as i only got myself one mac, so i have no past experience here with this particular case. May be some other experienced users can shed some light on this and share with us, before you try out?

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    All of a sudden my iPhone doesn't show up in the iTunes sidebar on my 20" iMac, but using the same cable it does on my MacBook. I have tried plugging it in diretly to the iMac as well as to my Belkin hub, but it no longer shows up in iTunes, nor does it charge when plugged it. The iPhone stays dark when first pluged in.
    Does anyone know why when plugging in the iPhone 3G or my iPod Classic (old school) it won't load on the side bar of iTunes? It is like it does not exist. I have done all updates. I restarted my computer a couple of times and finally got the iPod Classic to load but still the iPhone 3G shows nothing. It won';t even boot my phone up to charge it but will the iPod.
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