What is the cause of my laptop screen is flickering

can i know what is the cause that make my laptop is flickering .
I am using HP Compaq Presario CQ40-512AU .
Since i boot up the pc there has a flckering red colour line at the bottom of the screen .
what happens to this issues ?
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More about what laptop screen flickering
  1. its damaged pixels you have to replace the screen. i hope its under warrenty?
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