When I try to start up my xbox 360, it flashes three red lights around the center, and the power adapter light is green. The troubleshooting guide says to request a repair, however, when I tried to request a repair, I was told to register the console. When I registered the console, it said that Microsoft won't do out-of-warranty repairs on the 360, and sent me to the forums.
At this point since the warranty has been expired for so long, I figure that I might as well just open her up myself because I'm pretty good at electronics repairs. But is there some kind of diagnostic tool I could download first to figure out what's going on easily, or if not, does anyone have any experience fixing this?