Imac no longer charging via usb

27" iMac Intel Core i5 OS X (10.6.7)
So plugged in the ipod (via usb to the back of the imac) and left it to charge overnight. The next morning I notice it is not showing up in Itunes, and lo and behold has not charged a lick! So I thought it was the ipod, and that since the charge was so low, it would not show up in iTunes. But after plugging it in to charge at the outlet, it charged without a problem!
Now, set up the iphone to charge overnight (same usb port, I never remove the cable since it is such a pain to reach those usb ports! :/
and sure enough, after taking a look at itunes this morning I see it is not there, and looking at the device, it isnt even showing it has charged, nor does it show the icon that it is charging.
I am waiting for Pacific time to hi 6 AM before I call it in (under warranty) but I thought I would give a shout out there and see if anyone else has similar problems, although I have already looked it up and see a couple people have had the same problem, and had no luck getting it resolved....
I will post my solution, but I think there has to be something wrong with the port.
Had no problems since buying the the system approx. 4 months ago.....

Just tried another port at the back, and it immediately started charging and the device shows in iTunes....
So it has to be a bad port. Maybe because I left it plugged in??

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Imac no longer charging via usb

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