Looks like you have a bad GUI or X-windows configuration, his happens alot when ATI or nVidia video interfaces are part of the system. The short term fix is to boot into runlevel three;
When the grub splash screen is display press any key
Select the Linux boot choice then press the 'e' key
Select the kernel line and press the 'e' key again
At the end of the line add a space followed by the number 3
When done press the 'Enter' key followed by the 'b' key
Log on as root and type something like;
system-config-display --reconfig --set-resolution=800x600 --set-depth=16
This should give you a fairly generic graphics sessions which you can test by typing: startx
Also use the typed command lspci -v to find out which video card you have, if nVidia or ATI then you may want to search this forum for solutions.
Last edited by Lenard; 11-05-2007 at 08:23 AM.