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It's very likely that your MAC has suffered hard drive damage or memory RAM misplacement. Those two could avoid any PC or MAC from loading properly.
The most logical thing to do here is to bring the MAC to a specialized repair center such an APPLE STORE (if you have one locally) or Best-Buy (this one being the last resort).
Tell them about the incident, so they will know what they are dealing with and emphasize the importance of your data.