Itunes keeps asking me to restore or set a new device and won't enter my Iphone
I have a new Iphone 6s. I updated Itunes and restored my settings from my previous Iphone5. Now, whenever I connect my device to Itunes, and click on the Iphone icon, it asks me to set a new Iphone or restore from backup, and won't 'recognize' it. I want to backup my new phone, and sync it with my music library (on my computer), but I can't accsses the Iphone from Itunes, whenever I try to do that it only opens the restore from back up/ set a new Iphone window.
Any suggestions?
iPhone 6s, iOS 9.3.2