2009 MacBook Pro 15" screen replacement black screen.. Help!

okay here's deal. bought macbook pro 15" came without screen (was cracked , removed). works fine connected display. anyways bought water damaged (liquid spilled on keyboard) same model macbook, took out screen , put on macbook. macbook boots nothing on screen. believe hear restarting repeatedly. when connected display says no signal , reboots itself.

suggestions welcome! first time working on macs. i'm 17 , have been working on pcs 4 years. thanks!

 

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