Display is not working on Satellite P500-1DZ

Hi
P500-1dz display went black. No sign of anything on the screen so tried a new screen. Still no display.
Put in new Inverter. Still no display. Replaced the ribbon cable on the back of the screen.
Still nothing.
Hooked it up via the VGA port to an external screen. Works Brilliantly so am assuming its not the graphics chip.
Toggled Fn+F5. The external screen turned off but nothing on the laptop screen. Toggled back to external screen to a perfect display on that one.
Have installed the latest driver for the nVidia chip.
Still no display on laptop screen.
Help please! Going gaga trying to find the problem.
Have I missed something????

I thought about just buying a complete new screen with new ccfl light installed..but here is what I did..maybe i did it wrong?
I left the OEM screen/light alone, and replaced the inverter itself, which on my P500 series toshiba the inverter isn't grounded or anything, just dbl sided tape basically to the lid...no change...
then i got a new bulb and connected it to the new inverter with the light basically just sitting on the keyboard and the light didnt light up...
Then i replaced the LCD cable with a known good one, from what I was told at least...did samething as above and light still didnt light up.
I took out the OEM ccfl light and it appeared fine, no blown filiments or visible damage..
By everything works fine, just won't turn the light for the screen on?
Just hate to spend the money on a new screen if the light wont turn on again, figured the light wouldn't need to be installed to turn on
Message was edited by: guidoxpress

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