My lifebook has a black screen but windows running
It could be the monitor or graphics card or CCL are done. Or maybe a simple small switch that shuts-down the light when the lid is closed. I repaired a HP that the switch had "stuck" in the closed position, you could see the screen in the bright sunlight and see the windows OS. The background light,CCL in older machines, was not lit. I once had to access the rear of the monitor, in a laptop, to re-insert a loose ribbon cable that had jared loose causing the screen to go dark.
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