My iPhone 3GS will not connect to my laptop?

Okay, so My iPhone used to connect to my laptop every time I plugged it up. My computer crashed and I had to re download my iTunes, to this new version. I think its iTunes 11 or something, its the latest one. But after I did that, my computer will not find my phone. Has this happened to anyone? And if so, can anyone tell me how to fix it?

I had a similar issue, Itunes does not recognize the iphone when a service called "Apple Mobile Device" is not running, try to if you have windows, go to Control Panel > Administrative Tools > Services, and look the "apple mobile device" service, right click on it and then Enable and set it up as automatic.

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