Why won't iTunes let me put music on my iPhone? - 1

Hi so a few months ago my laptop before I got my iPhone so I didn't have a laptop to add music so I used my sisters laptop so I synced it to hers and everything worked fine. Recently I got a new laptop and synced my iPhone to it but its not letting my put music on my phone. Could this be because I have my phone synced to another computer if so how do I change this?

You Have To Use The Old Computer Use First Synced In.
If You Can't Use The Other Computer You First Synced With You Will Have To Reset Your iDevice.

Yes you are connected to her computer. But you can fix it. This only works for music since apple won't let you have her apps for free. Go to your iPhone in iTunes. Scroll down till you find a list of things with check boxes. Check the box next to "manually manage my music". That should allow you to get music onto it. Hope I helped

Yes, your iPod can only sync with on computer at a time. However it is easily fixed.
You can go into the account on your sisters computer and take your device off hers.
Then authorize the iPod on your own laptop.
If you go to the store, find "Purchases" in the right column. Sign in and you get access to any of your iTunes purchases. Download to your computer.
Sign out of your account and have your sister sign in and then down load all her purchases. Do the same on her computer and you can share music.

It would be easier if you like the same music to share an account, password and library. Your phone will sync wirelessly. But I understand doing it differently. My sons and I have one library, but each has our own Apple ID.