isync cannot connect to this device

Hi I just purchased an I Phone 3gs, I am trying to sync the phone on Mac Book Pro (snow leopard 10.6.8) but cannot. I have been able to assign the device to the computer in so much as when I open network preferences "IPhone USB" shows as "connected" and "Bluetooth PAN" also is shown as connected.

However when I open ISync and try to sync the device, the message is "1 device found" then when I press scan the message is " ISync cannot connect to this device.

Similarly the phone reveals 2 personal hotspot connections, but when I try to connect to my Mac Book Pro it says "connection unsuccessful".

I have tried deleting both the IPhone USB connection and the PAN connection and starting from scratch, and I shutdown the computer and re-booted but no luck there. I also tried connecting without the USB cable via Bluetooth and then with the USB cable but to no avail.

So it appears to be the final stage that is the problem, it is simply not recognising the device. I do not have this problem with other devices, such as external HD or flash drives.

Many thanks,

Michael.