Problems syncing iPhone to iTunes 7.6.2

I just installed Leopard on my MacBook. Since then I'm unable to sync my iPhone in iTunes. iTunes does not automatically begin to sync like it use to when I connected the USB cord. Has anyone had similar problems syncing their phone after updating to Leopard? I have already tried turning off my iPhone and restarting, did the same for iTunes. Any advice on how to resolve this issue?

Why don't you try installing iTunes again.

If I do that will I lose my music?

Ok here it what I would do.
Make sure the phone is charged
Try with a different USB cord if you have one
Restart the iPhone by holding down the power and home button at the same time for five seconds.
Then reinstall iTunes-I don't believe this will delete all your songs.

also try a different USB port...

Problem solved. I re-installed iTunes and that did the trick. I was able to sync my phone this morning. Thanks for all your help.