We can't possibly help you by reading your mind. Please edit your question or add a comment telling us the manufacturer and model number of your monitor.
My reading of what little information has been provided is that this is about an external monitor, not a laptop. As such, it wouldn't have a coin cell.
We can't possibly help you by reading your mind. Please edit your question or add a comment telling us the manufacturer and model number of your monitor.
Jerry Wheeler さんによる