How to resolve constant freezing of Fedora 12?

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http://forums.fedoraforum.org – I've recently installed Fedora 12, and it constantly freezes. The only common aspect between the freezes is that the freezes occurred when firefox was running. When it does freeze, I'm not able to use ctrl+alt+f[1...6] or even ctrl+alt+backspace. Has anyone else encountered and/or resolved this? (HowTos)