How Come My iPhone 3G No Longer Shows Up in iTunes?

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.
I use the iPhone on my MackBook with the same cord and it loads to iTunes and starts to sync. Same with the iPod. Both computers are running the same software. Since it works on the MacBook and use to work on then iMac G5 I am thinking it may have something to do with the updates for iTunes. I use the MacBook to charge the iPhone and iPod sometimes but the main computer for syncing is the iMac. Only nothing seems to work. After restarting the iMac several times the iPod seems to work then not work. I am frustrated. Any help would be greatly appreciated.
Thanks!

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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