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Mac Pro working but logic board LEDs on w… - Apple Community
SOLVED: iMac won`t power on. Power button pressed = LED # 2 lights up briefly - iMac Intel 27" Retina 5k Display - iFixit
Mac Pro 6,1 Late 2013 Diagnostic LEDs - LogiWiki
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My Mac Won't Start or Boot: How To Fix White Screen - AppleToolBox