Black screen issue

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http://forums.fedoraforum.org – Hello, I am new in linux, I did boot my pc by live cd of fedora 18 86-64, everything was fine and I can see my desktop, and then I choose its option to copy it to hdd, it is installed successfully and rebooted but after reboot from hdd I am seeing a black screen with a curser, no any mouse pointer , not any hang, its just black ! what did I wrong? I tried to boot it again with live cd and yes it is booted from cd and I can see my desktop, but again after boot from hdd its again black if it is from my graphic card why by booting from live cd it shows something and with booting from hdd (HowTos)