realy need help

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http://forums.fedoraforum.org – i installed a graphics update when i restarted it starts up with a blank screen i have pressed ctrl/alt f2 and it goes to term i put log in and and pass but it stays in term i have tried pressing ctrl/alt f8 but all i get is a little flashing cursor at the top left hand side of screen how can i resolve this i am nowon another computer at the moment paese im desprate (HowTos)