I have a dc7900 SFF and i attempted to replace the power supply with a 650 W ATX standard supply - no luck - no power - no lights what so ever - works fine in my equivalent Lenovo PC - Seems HPs is a proprietary PS design that prevents a standard atx from being used. I understand HPs logic to try to design a more efficient PS, but make it incompatible with a standard - i'll be switching my choice in manufacturers
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