my A1286 will not boot Recovery mode non response


hello, need a1286(mc723/a) 2.2ghz i7 2011. unit turn on , chimes heard, fan spinning hard drive spins normal start. display pitch black. unable see flash light when shine screen.
connect laptop external monitor. on external monitor boot white screen apple logo , spinning gear, that's it, won't boot past white screen. replace display , display cable(both new) still black screen.
have replace ram new ones, still same problem.i planning change new hd , install snow leopard 10.6.6 (dvd black disk) oh forgot mention had tried start combination keys apple support, nothing works, if else fails not know else try. if has experienced kind of technical problem, please not want go down road getting new logic board, expensive way.
thousand gratitudes.
 

have tried booting snow leopard install dvd?
 


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