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When I connect the server power cable to UPS it beeps once as if there is overload. Afterward the server turns on normally without any problem. This happens randomly every time I turn on the UPS or plug the server power cable into the UPS. I changed all internal parts of the server including VGA, Disks, PSU (except the MB) and even I used a backup UPS which also beeps slightly when the server is connected to it. Is it possible that the MB is causing this power problem?

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    please let us know what ups, server and power supply are beeing used. it could be that this is a normal behavior due that the current for less a second is higher due the reason that coils and capacitors getting charged – djdomi May 28 '22 at 14:17

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