Can anyone help?! I was fiddling around with Font Book and I think I have deleted a font. Some of my Apps (iCal for one) will not open now and instead repeatedly bounces in the dock. How do i reinstall all original fonts that were installed at factory? or at least what fonts are needed by the system in 10.3? Font book is picking up a lot of duplicate fonts as I have another version of OS X on a different partition on my HD Thanks.