Macbook pro 17" wont boot up

Greetings,
I left my macbook working on my desk , when i came back back the computer was in sleep mode, the computer woke up but the screen did not turn on, however i could hear the sounds of OS X when i clicked on the volume keys but no video. after holding the power button for 7 seconds the computer turned off. when i tried restarting the computer the sleep light would light up and remain solid, but it would not boot.
Took the ram out and the sleep light blinks 3 times, but when i put the ram back again but it goes back to the solid sleep light with out doing nothing
some steps i took
-battery is fully charged and it charges the battery
-unable to do a pram
-took off battery and disconnected form wall and hold the Power button for 8 second
i would also note that this machine had the logic board replaced due to the nvidia 8600gt recall.
Thank you in advance
-Illankid

well i took my mac to an apple authorized service center, the tech told me that computer does not boot up and thus they are not able to perform the "nvidia test" which mean that the laptop does not fall under the recall. so im stuck on ordering a new logic board on my dime.ill update on my decision.i am missing it.

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