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It's possible that 1 of 2 things has happened. Either your hard drive has failed or the logic board has failed. Before you try any repair though, I would recommend that you let it sit and cool off before turning it on again.
One thing that was not mentioned is if you are upgrading to a larger capacity hard drive from the original, you can clone the original hard drive (if it hasn't crashed) to the new one then do the swap. You can then use the Universal Drive Adapter to format the smaller drive and use it as you wish.
If you still have the DVI to VGA adapter that came with the computer plug it in to the plug and screw it tight, that way you will not put one of the screws into the holes.