My computer wont recognize my iphone 4. when i plug it into any computer it doesnt charge. i followed the procedure on the website but the device manager still says unknown device. any ideas how to fix this???

My computer wont recognize my iphone 4. when i plug it into any computer it doesnt charge. i followed the procedure on the website but the device manager still says unknown device. any ideas how to fix this??? the weird thing is it use to work until yesterday. thanks

Will it charge when connected to a wall outlet? The USB port on your computer must be 2.0
Powering Apple and third party peripherals through USB

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On this Apple site, I am seeing alot of issues with Iphones not working and Imessage not working. If I were you, I would tell Apple Support to let them know whats happening.
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Try:
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