At my wits end with blackscreen on my HP DV7 Pavillion piece of crap computer!?

I have done everything I know to do with this thing...ctrl+atl+delete...fn+F1 F2 F3....shft F12 even took laptop apart and made sure no connections was loose just cant get any program information what so ever on this screen...even hooked external monitor up to it and didn't get anything ,not even a cursor!!! About to put my foot on top of it and say to heck with this thing!!! Hp sux!!!