when I use my Toshiba laptop the screen will turn black but it only does this after it goes into sleep mode and when I turn it back on a little while later the screen turns black and I have to turn it off with the power button and turn it back on for it to work. it doesn't do it at all as long as it doesn't go into sleep mode. what could be the issue with my laptop?

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Answer:
Your backlight inverter could be starting to burn out. it may need to be replaced.