Dear Dell Support !

I have a PC DELL 755. When it reboot, it have a notice: " The system management hardware requires a reset.System setup configuration and the date/time require attention after the reset.
Strike the F1 key to continue,F2 to run the setup utility
Press F5 to run onboard diagnostics "

I had check all hardware, replace battery CMOS, load defalt factory  BIOS .... but not ok. still notice this error.

I want to knows what hardware is error? how to solve this  problem.

Thanks for reply !

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