Reboot frequently results in black screen


i’m running 2010 27”, upgraded ssd , more ram, , recent high sierra beta. last several months, reboot more not results in shutdown , reboot black screen functional cursor. have hold down power button , reboot again. i’d guess 80% of time, have reboot multiple times (like 5 or 6) before can boot log-in screen. i’ve heard black screen+ cursor sign of update issue, i’ve been through several updates way.

suggestions?
 



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