I did a ram upgrade and swapped a 1.0 heat sink onto a 1.2 mobo and no get a solid black picture with no sound? I thought I may have screwed up the ram but get the same result when I plug a chip in with xblast. Then I noticed that if I plugged in my hard drive the light ring switches to my XBMC settings. I get the same result when booting from disk also. There does not seem to be any missing components from the board around any of the work areas. This was an issue with both component and composite cables.
Anyone have any ideas on what to check next?