know why windows defender keeps recommending battery life setting change screen full brightness less bright setting when brightness down low can go? have acer aspire 7741z-4643 screen duplicated hp   w2007 monitor , option dim monitor grayed out. time.                  
  
                hi brian,
  
  
  please provide answers following able learn more issue you're experiencing:
    - is windows 10 up-to-date?
   - are drivers up-to-date? if not yet, can follow steps found on  link on how update drivers in windows 10.
   - since when did issue start? changes made or things you've done before issue start?
   - what exact message you're receiving being shown windows defender?
   
    meanwhile, running power troubleshooter finds , repairs problems computer's power settings. here's how run  power troubleshooter:
    - right-click start icon, select control panel.
   - choose large icons option view by drop down list found on upper-right part of control panel window.
   - locate select troubleshooting.
   - click view all left pane.
   - locate , click power run troubleshooter follow next steps.
   
    let know happens after running power troubleshooter.
  
  
  regards.
             
                Windows                /                        Windows 10                    /                        Performance & system failures                    /                        PC                
 
  
 
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