I too am afflicted. HD3000 Graphics. Gigabyte H61N-USB3 I3 2150 . I once found a solution somewhere when trying to make this a Mac Mini clone. It actually involved installing rebooting etc... in a certain order . My system worked for a long time both on Mac Lion & on win 7 . Now Im on win 8 and I cant find the original post I had followed. I can get my system to sporatically detect HDMI but it just flashes a horizontal random colored line or a solid pattern (currently purple) screen. Resolution detected at oddball on 42 Vizio 420VL TV, such as 3840 x 72, 1920 x 2, xxxx x 150, etc..... I can use vga and most times dvi to hdmi simultaneously. However sometimes when problematic I unplug vga reboot and dvi to hdmi out is in extended secondary mode and useless. I like to only use hdmi or dvi as I leave the VGA available to work on customer computers. Ironic as I cant seem to fix my own!!
Help please