Why won't itunes let me sync my iphone?

I just added my iphone to this computer and authorized it and everything. It is authorized on 4/5 computers. I have added one song to my list and when i go on 'file' then 'devices' then 'sync' and other options i'm unable to click on it, and its a lighter colour? Why is it like that and how do i change it so i can sync my iphone and its music?

Is the "manually manage" check box unticked? It needs to be to sync

  • Why won't my iTunes let me sync my songs? I have restarted my laptop, un-installed iTunes then reinstalled it again several times. And after I do any of them I will plug my iPhone 4S into the USB (with cable) port and it'll start syncing my music but then a notification will pop up and say my music can't be found. But all my music is still in the iTunes. I don't get it?
  • Why won't iTunes let my iPhone go into iTunes? My brother put a password on my iPhone, and he forgot it. I, stupidly, tried a whole bunch of passwords to see if I could get it, and not my phone is disabled. I tried connecting it to iTunes to get it undisabled so I can restore my phone, but it keeps saying I need to put in the password in order for me do get onto iTunes. This happen to anybody else? Can somebody Please help me!
  • Why won't itunes let me sync with my iphone? When I plug in itunes and my phone, i get this error message: "Itune was unable to load data class information from Sync Services. Reconnect or try again." I try many times. After this error message pops up, itunes freezes and i have to go to windows task manager to close it. How do i fix it so i can sync again?
  • Songs in itunes won't sync to ipod but will sync to iphone? So i have over a 1000 songs in my itunes library and they will all sync to my iphone no problem. But when i try to sync to my ipad (which has enough memory available) it will not.