IPhone 5 not being recognized by iTunes but rather iTunes crashing

Question

Hi,
This is a bit long winded leading up to the current issue I'm having.  To start of with, I'm using:-
iPhone 5, iOS 7.1.1, 16G
MBP (mid-2010) 2.66GHz, i7, 4GB 1067Mhz DDR3
OS 10.9.3
iTunes 11.2.1
The battery on my iPhone 5 (1 yr old) was being drained too quickly - a 40min review of news articles on the train would drain my battery from 100% to 80%.  This was the case after switching off the 'Background Refresh App' function and closing all apps in the background. So I took it to Apple who ran a quick diagnostic that came up with no issues with the battery.  However, when running an extended diagnostic, the phone was unable to complete this. So they decided to replace the phone.
Here is where it gets a bit hairy.....
I'm in the UK and the genius asked me to erase all my data.  I did and then she realised she had to order a phone from the US since that's where I bought mine from - 'like' for 'like' apparently.  Up till this point, the issue was solely with my battery.  The phone was syncing fine with iTunes both through wifi and lightening USB cable (Apple original).  I took the phone home to restore it from a backup but it wasn't being recognised by iTunes.  In fact, every time I plugged it in iTunes would stop responding necessitating a 'force quit'.
Two days later, I received my new phone.  I fired up iTunes (working fine) then plugged in the phone to set it up from a backup (FYI, I don't back up to the iCloud since I'm not keen on their T&C's).  Again iTunes stopped responding.  If I force quit iTunes and started it again without the phone plugged in, iTunes works fine.  If the phone is connected, iTunes won't fire up (or would become unresponsive if already working).
I uninstalled iTunes including deleting the following files:-
/System/Library/Extensions/AppleMobileDevice.kext
/System/Library/PrivateFrameworks/MobileDevice.framework
restarted the MBP then reinstalled iTunes.  Unfortunately, the problem remains.  I've connected another iPhone 5 and again the application is rendered unresponsive. There is no doubt that the problem arises when iTunes tries to comunicate with an iPhone.
Any suggestions on what the problem might be and how to rectify it please? Thanks.

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.
☞ The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
☞ Some private information, such as your name, may appear in the log. Anonymize before posting.