have you tried the following:
1. take ipaq out of the cradle. 2. click start and go to ActiveSync 3. Click on Tools on botttom left hand corner. 4. Click on Options. 5. Make sure a Tick is in the Enable synchronisation when cradled and that bluetooth is enabled and not USB.
I had this problem with mt Toshiba when i had to reset it and it wouldnt sync, it defaults to bluetooth for activesyncing so i had to change it to usb.
also have you updated your activesync from click here
hope this helps