Three days ago I have installed Raspbian, RaspBMC, and Pidora by NOOBS v1.3. The first two OSes run well.
When I chose to boot Pidora after the first time setting up (I chose to boot into GUI directly), all the characters I saw on screen were all blank with black squares! I couldn't see any font applied to those message in the login screen.
I tried to guess where the password field was and entered my password. Later, after login, I saw the desktop had the same problem. At first I planned to re-install Pidora but found that NOOBS will destroy everything on the SD card even if I want to install only one of these three OSes.
How do I fix the problem without loosing my other two OSes because I have already configured many things on them?