No devices showing in iTunes

Apologies as this has been discussed before but none of the solutions are working.

 

Running:

 

• iMac 20inch early 2008 OSX 10.8.4
• Running latest version of iTunes 11.0.4
• Running latest verion of IOS 6.1.4 on iPhones
• Running latest version of IOS 6.1.3 on iPad

 

None of our devices show in iTunes,

 

• 2 x iPhone 5's
• 1 x iPhone 4
• 1 x iPod touch
• 1 x iPad

 

To date I've:

 

• Reset all devices
• Restarted iTunes
• Rebooted the MAC
• Used every original Apple sync cable we have (4)
• Tried all 3 USB ports in the rear of the MAC

 

All to no avail.

 

Can anyone help?

 

Thanks

 

Ross

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