Last night there was a power outage and now my computer will not boot up. After pushing the power button and seeing the BIOS I only see a black screen with a white cursor at the top left of the screen. I plugged in an external hard drive and put in my live CD hoping I could use the live CD to copy my files from my home folder to my external drive. But when I opened the home folder each containing folder says I do not have access to them and they are all empty. I assume this is because I encrypted my home folder when I first installed Ubuntu. How can I get my files back?