If my charger cord doesn't light up at all when I plug it in and attach it to my MacBook Pro, does that mean its broken? I'm not a Mac person but got one for my daughter for Christmas. Everything was working fine until she had it with her today without the cord and ran it totally down till it was out of juice. When she got home and plugged it in, the cord didn't do it's usual light up thing.

I noticed some chew marks in the plastic on the cord - looks like the cat was playing with it. Is it gone?