3 Beeps after High Sierra update


hi guys, have late 2011 17inch mbp, fine until updated high sierra, getting 3 beeps on startup , isnt loading os. seems 3 beeps associated ram, why after update? boot safe mode , recognizes of ram installed.
 

have tried running macbook 1 stick of ram?

perhaps coincidence ram issue appeared change high sierra?

high sierra installed upgrade on sierra or clean installation?
 


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