I'm new on linux (Fedora) and today while trying to install google earth and MySQL http://www.linuxlinks.com/article/20071021085924955/MySQL.html, after re-start the computer I got the message: cannot open font file true. I found some help such as "edit your /etc/default/grub file, and on the lie with GRUB_CMDLINE_LINUX there is a parameter that says SYSFONT=True". All help I found online did not work because I can't login in Fedora and therefore can't access the terminal. The only thing I'm able to use command line is GRUB that does not accept any of the usual commands.

If it is not possible to solve this bug, is it there a way to do a back up of my files to an external HD from GRUB?
 thanks for any help! I'm bit desperate because I have quite important data.

Best regards

Alex