ATV just 'clicks' when I turn the key

[gio2008rider]

I have a fully charged battery in my ATV. When I turn the key it just makes a soft 'click' sound, but doesn't turn over.

Someone suggested putting a screwdriver across the CDI box (think that's the thing that the starter motor hooks onto). I did, and it sparked.

I checked all the fuses I found and they were good, what could my problem be?

Thanks!