Problem getting newer Version installed

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http://forums.fedoraforum.org – My computer worked fine for almost three years. Now with uploading pictures suddenly I got a problem and it turned out, that my versions were too old: Fedors 9 and Firefox 3. So I decided to try upgrading via iso or live DVD. download worked fine with the checksum test and burning the DVD with Gnome Baker. But I cannot get them to work. I can see the first screen but upon my return the screen turns black and there is sound from the computer, that tells me it is working. I am not deeply firm in Linux. Please give advice in simple steps. (HowTos)