I have a windows 7 computer with iTune V126.96.36.199. All of a sudden, when the user plugs in her iPhone to the PC, no response from anything - no popup message, no sign of iphone on My Computer, not even in iTune.
I had the user connect the same iphone 4s to another Win7 PC and iTune immediately recognized the iPhone.
Also I had he user connect the different USB port on this computer, but to no avail.
What should be next course of action other than simply installing newest version iTune V12?