New screen and inverter still dead

I was told the screen was bad on our HP Pavilion dv4-1220 laptop so I installed a new screen and inverter. Still is dead< nothing happens. Laptop works when connected to an external monitor. Any ideas what else I can try? The driver for the video card is current. Thanks Larry
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More about screen inverter dead
  1. bad cable?
  2. If the florescent tube isnt lighting up you should probably check the input voltage to the inverter board.
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