DELL Inspiron 8000 screen display sometimes red and dull

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DELL Inspiron  8000  the screen display  sometimes (not often)   becomes
  red and dull just as if it is switched from bright mode  to red and
dull mode  and sometimes  it just goes dull without the red tint.

If I reboot it goes back to normal!  Anyone have any suggestions as to
the cause ?

Do I need to change the back light tubes?

Thank you for your help.

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