ITunes won't connect my iPhone?

Okay I don't know if anyone else has the same problem but for my birthday I got my own laptop, so I transferred all of my music from my bother's laptop, but then I tried to connect my iPhone to it, and it didn't work.
I verified my laptop to my iTunes account and it lets mt upload music onto my iPod, and I've tried every cord I own, I restored my phone, I backed it up, I've synced it with my laptop, I've re installed iTunes multiple times and it makes the USB sound when you pug something into the outlet, and it shows up on my iTunes, and it charges my phone, but it just won't let me manually drag music onto my phone. I've tried everything I could think of and find on the internet but nothing works.ITunes wont connect my iPhone - 1

This happened to me once. It was because of an update. Make sure your iTunes has the latest update.