No longer able to connect to any computer with iPhone 4s

I have a iPhone 4s. I connected it to my Macbook Air today and instead of changing the battery icon to green and appearing in iphoto, nothing happens. Same for iTunes. When I plug the phone into my charger, the charger works. So its not the USB connection.
I tried it in a PC and in my Mac Pro. Same deal. Prior to today all of these computers saw my iphone and I was able to download photos, update music etc.
Now, none of them seem to connect and they don't appear in any programs.
I restarted the iphone three times and the computers, but nothing has been helped. At least I can charge the phone, but I really want to get the photos off it as the icloud sync is iffy. Plus its a lot easier when the computer connects to the phone. Why has this suddenly broken?
I have the current iOS7.1.1
Help?

Thanks for the feedback. I really really think it is something weird within the phone because:
1. I have 3 computers which all have synced in the past and now suddenly they all do not work
2. the usb cable charges the phone when plugged into the charger, but no computers connected to the iphone with the same cable are recognised
3. I tried another iphone cable and get the exact same results
I did update itunes but it did not help
I tried the AMD settings but it did not help
I even put the phone into "plug me into itunes" mode and even that did not work, on a newer macbook air, with the latest itunes. I restarted the phone and it is back to the way it was, eg not connecting, but otherwise seems ok.
So, I'm still stuck. If it comes to it, I will zap the entire unit and let icloud reload it, but that is a rather extreme measure.

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