Iphone won't connect to iTunes? - 3

Okay, so i have an iPhone 4S and it has been great. BUT now it won't connect ot my iTunes, which is a big bummer since I use mine like crazy. My Dell keeps telling me my USB will not respond but when I connect my iPod Nano, it works just fine. (Like iTunes finds it and will sync to it) My phone will also charge and still works like normal… It just won't connect to iTunes. I have tried everything. So am I just SOL or is there something else that will get it to work?

I was gonna tell you to plug it in a different computer until you said you've connected a ipod nano and it finds it if by any other chances try a diiferent usb if you can have you try restarting your computer I really don't think there's anything wrong with the phone yet I think its the computer not getting it but by chances hold your home button and lock button at the same time on your iphone connected to yiur computer open itunes ofcourse and see if it pops up you should hole the buttons together for atleast 10 to 15 seconds