OptiPlex 780 - Steady orange power button light + numbers 1 and 2 blink every 1.5-2 seconds. - Dell Community
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Solved: Turned on my OptiPlex 780, now starts to power cycle. When I hold the switch behind battery, blinkin... - Dell Community
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dell optiplex 780 orange light on power button/Desktop Motherboard Repair/ICH data missing - YouTube
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