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Black screen on power up

I turned on my computer the other day and the screen wouldn't power up. I can hear the fan running and it makes the noise like it is turning on but nothing on the screen. I plugged it into an external monitor and the screen displays on it. If I shine a light into the laptop screen I can faintly see the images. My tech guy said it was the motherboard and would cost $600 to replace it. Before I go and buy a new computer or pay for the new motherboard, could it be something else?

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Hi @notacomputerguy, what is your laptop model number? From experiences I suspect it the LCD backlight or inverter could be faulty.

http://www.laptoprepair101.com/troublesh...

http://www.ebay.com/gds/How-to-Repair-Yo...

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@salmonjapan it is a toshiba satellite L55t-A5186NR

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