Itunes hangs. can't sync with phone. have re-installed, not luck. as soon as i open itunes it says cannot sync with phone and hangs

Question

Since a few days ago I am unable to sync my iphone 5s with itunes on Macbook pro.
As soon as I open itunes, it hangs. it doesn't give me the opportunity to disable or enable the syncing, it hangs immediately. I have also tried removing itunes from Mac to re-install, but it does allow me to remove itiunes as "OSx requires itunes".

Answer 1

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
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