No video on 17” MBP


was helping friend 2010 17” mbp had bad hard drive. not boot. plugged 1 of clone drives in , booted , ma 9 fine. since had spare bare drive loaded os on , swapped in. while case open used vann d air clean out accumulated dust. buttoned , powered on screen showing nothing. unplugged , replugged video connector on logic board no joy.

ideas of check next? have gotten messed up?
 

pram , smc reset?

can see on external monitor?
 


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