[jimblack]

Error message telling me to reset time & date or that it is out of date. I comply, but the message continues. I have replaced the battery. When I reset through the F12 boot option, I get a rather loud BUZZING sound. Running Win 10, 64 bit, Dell Optimum 780.  Finding info on this subject has been scarce. 

 

jimblack

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When searching try "Dell Optiplex 780" instead of "Dell Optimum 780".

 

If the system cannot keep the Date/Time current, it means the CMOS battery (on the motherboard) is dead and needs to be replaced.

 

https://www.dell.com...esktop-computer

[SpywareDr]

When searching try "Dell Optiplex 780" instead of "Dell Optimum 780".

 

If the system cannot keep the Date/Time current, it means the CMOS battery (on the motherboard) is dead and needs to be replaced.

 

https://www.dell.com...esktop-computer

[123Runner]

The CR2032 is pretty much a standard in desktops. You may have got a bad battery. Do you have a meter to check the voltage?

A new battery will read about 3.3 vdc and dead will be about 2.7vdc.

The check needs to be done with the battery out of the computer circuit.