IPhone won't connect to iTunes on computer?

I tried to plug my iphone into my computer to put new songs on it from my desktop iTunes but it won't show up as being connected on the left sidebar.what's going on!

When you download it drag it into your phone or your sync settings are messed up

It is possible that the drivers have somehow been corrupted. Try uninstalling itunes.restarting your computer, turning on your computer, installing itunes again, then restarting your computer. Open itunes then connect your iPhone to your computer. Hope that helps.

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