first, can you boot your linux all the way up or it just stock at the middle of the process. Are u saying you can't get graphical interface or what?
If it's the issue with graphical interface.
Then press ctrl-alt-F1, after it boots or wait until it gradually stops.
Which boot loader do you have?
if you have grub here is the instruction
$cat /etc/grub.conf # to display your boot loader, make sure it's here
$vi /etc/grub.conf # to open editor, after you hit enter, a screen will appear and for the very first line without an # as the first charactor in that row.
You should change 5 to 3.
Then that should be good to start a terminal.