what do u mean by booting into a black screen? do u see startup messages when it's booting up? what i mean is from GRUB you'll be asked for a kernel/OS to boot and when you choose your fedora system do u get to the point when it says "Starting [service name] [OK]"? let me know.
anyway, here's a quick fix u can try:
1. boot to runlevel 3, fedora8 boot into runlevel 5(multiuser with gui) by default. to do this, at the grub screen, highlight the fedora kernel u'r using to boot and press "e" to edit its config. at the line where it says /vmlinuz....... add "3" at the end of the line without the quotes and press ENTER then "b" to boot.
2. hopefully, if u'r graphical setting is just the problem, u'll get a login prompt. log in as root and edit /etc/X11/xorg.conf(remember to back it up first). Look for the "Section" line:
Section "Screen"
Identifier "Default Screen"
Device "nVidia Corporation GeForce Go 7900 GS"
Monitor "Generic Monitor"
Defaultdepth 24
SubSection "Display"
Modes "1920x1200"
EndSubSection
EndSection
Change the value of Modes to something like "1024x768" or "1280x1024" or whichever suits your taste, but it's advisable to set this value to a low resolution for testing right now. Save and exit and when you get the command prompt run "startx". check if the gui is now working.
anyway, update me on this.
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