I just recently installed Fedora Core 4 for my Linux Plus certification. Most of my time will be spent on the command line of a terminal especially on tty1-6. When I enter alt ctrl F2, I can't see a terminal. All I see are pink horizontal lines on the top and bottom of my monitor and bluish greenish vertical lines. I installed it automatically since I'm green to Linux and I would love to learn it. The only reason for this problem I can suspect might be the incorrect drivers for the video card might be installed? I have an S Virge video card in my box, and it is not dual booting with any Windows OS so I have no idea what S Virge video card I have in there unless I open the computer and take a look at it. Also I have an Optitrex monitor but I don't have the option to select it and I wonder if that can also be the problem as well. I see it as an option, and I select it but it would not allow me to install whatever it needs, like the drivers or something, my options are grayed out. Can you help me resolve this issue so I can continue with my studies. I will grately appreciate it.

Thanks,
Kelvin.

O my Lord the only reason is u must fed in vertical and hor refresh rates of oyur monitors in your xorg.conf files

If I did, is there a way that I can reverse that and what exactly should I have done?

to reverse it just delete the lines from xorg.conf or conversely make a back up of xorg.conf and make a new xorg.conf.....to reverse it use the backup xorg

X is ctrl-alt-F7 and above, so I don't believe xorg's config file would matter. CLI uses VESA framebuffer for graphics. To configure that you need to edit your bootloader's config file, probably default grub.conf, to force vid card to use a resolution monitor supports. Quick google turned up this, but you might want to google further on the topic.
http://forums.gentoo.org/viewtopic.php?t=33841

To enter the grub.conf file but I was denied access. As I said before that I'm new to this operating system so I'm not familiar about how to navigate to open files and change configuurations and variables. One thing I did notice while messing around with FC4, that there is a Configuration Editor. Can I use that instead to try and change the resolution? Also I tried to change the monitor to see if there were any changes, and there were none, I see the same screen when I enter <alt>, <ctrl>, F2, horizontal pink, and vertical blue lines. I'm also aware that if I set the resolution too high, it does something seriously wrong either to the monitor, the video card or something like that. So if someone can help to navigate to wherever I need to make the changes then that will be helpful.

To edit grub.conf, you must first become root. type su -and give the root pasword. then type jed /boot/grub/menu.lst
replacing jed with the name of your text editor. Jed is very good and also user freindly, if you don't have it, type, again as root,yum install jed