after installing updates on Fedora 13, unable to startup

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http://forums.fedoraforum.org – I am almost a complete n00b to linux, but I can follow explicit directions and ask questions. I recently updated my software (on Fedora 13) and after the updates had finished installing, it said that the computer required a restart. I noticed that I could no longer type anything into the search bar on Firefox without an error message appearing. So I thought it best to restart the computer then. When restarting, the loading screens took much longer than usual. The guitar pick shape that fills with white was stalling around the top. (I know, I love my complete comprehension of the p (HowTos)