Seeing desktop on both screens

Hello,
I have hp probook 4320s.
I connected an external screen and saw the desktop on both screens.
For some reason it stopped working and now I can see my desktop just on the internal screen or the external screen but not both of them.
Can someone advise me what should I do?
I have 4 screens configured at the display settings but just the first one is set as primary and this is the only display screen that is recognized by the computer (the others are inactive).
2 answers Last reply
More about seeing desktop screens
  1. Go into display settings and check the box for extended desktop
  2. AaronC8319 said:
    Go into display settings and check the box for extended desktop


    Did it but still have the same prob.
    It looks like I need to change something at the graphic card settings.... I have an ATI graphic card and there are some other settings.
    I didn't find anything that match what I am looking for.
    Do you have any idea?
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