It's not easy to get to, but I replaced the CPU on mine and it worked fine.
I had the no display, no post, no boot issue. (Of course, there's always that 10% chance that all it was was a bad connection and taking it apart and putting it back together was really the solution. After I test the CPU in question with another AMD laptop, I'll post back.)
EDIT: I'm sorry, this information is not relative to you as you were able to post, boot and view on an external monitor. In which case, you would need to put the laptop under a bright light and let us know if you can see any faint video on the screen.