External monitor to windows 7 laptop

my windows 7 dell laptop cannot detect the external monitor LCD sony bravia. can you give me a solution for this..thank you
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More about external monitor windows laptop
  1. What have you tried already? Have you changed cables, tried the monitor on another system, tried a different monitor on the laptop, used the function keys on the laptop to try to move the screen over?
  2. Go into control panel/ displays and enable add-on monitor.
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