The last two times I shut my computer down it froze during the shutdown process. Now it won't start back up. It's giving me the diagnostics numbers 2 and 4, which signals graphics card failure, so i took my graphics card (Nvidia geforce 8600 gt) out to look at and two of the capacitors have large cracks in the top of them. i took the card out and tried to use my integrated card, but it gives me the same diagnostic lights. i tried putting my old ATI radeon card in, and then it gives me lights 1,3,4, which the manual doesn't list as a combination, and the computer shuts down and restarts every ten seconds or so. took the radeon card out, and it gives me 2 and 4. anyone have any ideas about what could be causing this?
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