hi there, im having trouble with my gfs computer.it needed a reboot so she brought it to me.why i dnt nw.once opening i found that much dust it was unreal. Anyhow after takeing apart and giving a good clean i built it again and im nw getting no picture the computer starts and all fans work can even hear the hd working.what could it be. the specs are the mobo is a kn1 sli lite extreme with 2 sticks of 512 ddr ram.it has a radeon x1300 512mb card and seagate hd.