Question optiplex 990 not powering on

Abs2428

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Mar 17, 2019
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i have dell optiplex 990, when I plug power cord to power, PC does not get power, even the LED light of PSU doesn't turn on, I press power button , still doesnt turn on, but when I press PSU diagnostic button, PSU turns on , PSU LED turns on, CPU Fan also turns on, but Displays nothing.
what is the problem, help me
 

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