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Optiplex 780 power supply - home - dell community, What dell power supply models are compatible with the optiplex 780 mt and the 780 dt?. Support | dell us - dell official site - the power to do, *offers subject to change, not combinable with all other offers. taxes, shipping, handling and other fees apply. u.s. dell home and home office new purchases only.. Optiplex 780 will not boot: 1 & 3 lights blinking & power, Optiplex 780 will not boot: 1 & 3 lights blinking & power button blinking amber.