How to avoid image retention
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To activate appropriate screen saving, proceed as follows:
1. In the display OSD menus, open the Settings menu and switch 
DPMS on. For more information, please consult the display 
operation chapter.
2. In Windows, open the Display control panel. Open the Screen 
Saver tab.
3. Select a screen saver from the Screen saver drop-down box.
4. Set the Wait time to 10 minutes.
5. Click the button Power... The Power Options Properties dialog 
opens.
6. In the Turn off monitor drop-down box, select After 20 mins.
7. Click Apply.
8. Close the control panel.