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December 8th, 2020 12:00
Optiplex 755 display not working
My optiplex 755 isn't displaying an output. The front 'on' button is a solid orange and the screen is receiving no signal. Anything anyone can tell me I would be greatful.
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redxps630
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December 8th, 2020 18:00
try replace cmos battery and reset cmos jumper (RTCRST) on motherboard. you have a No video situation which can mean No POST if video cable connection and monitor are both good.
see p.15 for jumper setting https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-755_user%27s%20guide_en-us.pdf
speedstep
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December 10th, 2020 08:00
solid amber power button = dead power supply or dead motherboard.
5vsb is working but nothing else is.