Itunes will not recognize my iphone?

I just got my iphone replaced today and i backed everything up from my old one on my computer however when i got home to transfer everything from the backup to my new one it was not showing up when i plugged it in for itunes. I just updated itunes this morning and i do not think it has anything to do with the cord because it is charging and my computer recognizes it just no itunes.

An iphone can be synced with only one iTunes account at a time. Once you switched to a new iTunes account or a new computer. You have to authorize your iphone to it at first, then you can upload music and video from iphone to computer. You can refer to this guide that helped me before for how to transfer files between iphone and computer
http://www.001-software.com/resource/ipod-iphone-ipad-new-computer-sync.html

Hope this helps.

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