Hello,
Since you are able to get to the command line. Give this a try:
please enter:
Code:
PROMPT#>sudo dpkg-reconfigure xserver-xorg
Keep the default answers, if you do not know what to answer. Pay attention to your screen settings, this is probably what makes your graphical session not available. Once you're done, enter:
Code:
PROMPT#>sudo reboot
Hopefully you session will return.
Also did you get the files cleaned from your home folder before power loss? If not make sure you clean them. This could have a harmful affect on starting.
Good Luck,
Jaysunn