Fedora 18 Hangs up on startup

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http://forums.fedoraforum.org – After almost a dozen tries , I was able to install Fedora 18. The problem I faced was just as the fedora logo loads up during startup, my machine hanged. After installation , fedora booted up with no problems. But when I restarted the system, it again hanged and till now I have not been able to boot up fedora. I have no clue what the problem is , and i've tried again and again to run fedora but it always hangs. (HowTos)