IMac not recognising iPad2 or iPhone

Whenever i plug my iPhone 4s or iPad2 into the USB and ocnnect it to my iMAc, the iMac won't recognise it.
Nothing at all happens - it will only charge. Usualy iTunes or iPhoto will open up and recognise my device, but not now.
I am running the latest software, I've tried restarting all my devices- but nothing works.
It must be an iMac issue, I'm running iTunes 10.5.3 which is the latest.
Can anyone help?

OK, let's try a couple of resets it's possible they may work. Do each reset 2x please.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After you have completed both resets 2x then re-open iTunes with one of the devices (iPhone or iPad) connected and see if they show up in Devices. If not you now know how to show or hide them. If they still don't show up then re-tread the support assistant steps per the link I provided in my last post. If they still don't show up you will need to call AppleCare or visit your local Apple Store or AASP for some help.
BTW have you tried different cables & USB ports to eliminate a connection problem.

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