On my PC booting process was busy before logging in, I switched off after 5 mins. That was the first boot after installing pidgin vv. Then I reinstalled and formatted the /home partition as well, recompiled pidgin vv, and then when normal booting I had only the blinking cursor. In recovery mode I uninstalled pidgin, but no improvement. I reinstalled the OS without formatting the /home partition and now also GRUB failed... Next time I will boot a liveCD and try to check the system logs.