Replaced Screen/Case Now Doesn't Turn On

hello guys! wondering if can me out.. had old macbook white , decided switch on black due screen cracked , worked fine... put , nothing happens... put new battery (don't know if has it) nothing seems happen when push power button on keyboard (maybe it's broken due pulling off?) it's pretty burnt on underside.

went through reset procedure on apple site, makes me believe if keyboard isn't working, wouldn't possible it. took out ram , tried starting listen beep nothing seemed happen. (btw charges) have new keyboard coming wanted know if there else try wonder if wrong or bad.. help.

- possible problems?? -

*hd failure
*logic board failure
*screen issue?

people think? suggestions, want thing running

 

do know new black keyboard works ?

still have old white keyboard try ?

chances ribbon cable keyboard logic board broken (maybe internally).

best check working before reassemble.....

 

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