[LINUX] XBMC blank screen on startup

Hello, I've just installed xbmc on Ubuntu 11.04. I am using intel x86 dual core processor and intel graphics card. When i start xbmc, it just shows blank screen. When i press some keys like esc, enter i hear little beep sound, i think that must be from xbmc. Thus, it means it is started but shows blank screen. I tried removing .xbmc/userdata/guisettings.xml as it was posted on another thread: http://forum.xbmc.org/showthread.php?tid=57731 but it didn't work. Thanks in advance.