Device has not been recognised ...any suggestions - its never previously been a problem

Although I have had noproblems up to now, suddenly neither my i pad nor my i phone will sync with my PC
I get a mesage saying that the device has malfunctioned and has not been recognised
has anyone any suggestions as to the cause and how to fix it?
Paul

Hello Bidger and anyone this might concern,
I'm having a similar problem with my iPad 3 WiFi + 4G (although not 4G in Sweden, but anyway). When I yesterday tried to hook my iPad to my mid 2011 iMac 27" wanting to synchronize it, I got a warning message that I've never seen before and not being known on the interwebs when searching for it.
Translated it says: "iTunes couldn't connect to this iPad. Can't establish a secure connection with the device". Wierd I thought, tried to search for it and got hits that were similar but not in my opinion the same problem at all. Some people had problems a couple of years ago giving the similar error message, that had to do with the date and time not being the same on the iDevice as the computer hooking it up to. I checked my settings but everything checks out all right.
After a couple of tries of restarting both the iPad and the iMac, reinstalling iTunes etc etc I tried to connect my iPhone 4S. That went just fine, without a hitch. I was able to synchronize it, do whatever. So I took out my MBA 13" late 2010, connected the iPad to it and started iTunes - voilá it worked just fine! But still, the issue remains on the iMac today. I can't for the love of Steve understand what the problem is.
So, anyone out there sitting on an awesome fix?
Thanks,
Jacob

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Device has not been recognised ...any suggestions - its never previously been a problem

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