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anything work?

Or have you inadvertently pressed external display ie projector ??? its F4 on my HP worth pushing all the F buttons individually just in case.

Possibly the backlight not lighting.( This is also the same with LED TV's when my back light was knackered on my laptop it cost £50) A quick way to check is with the room dark, shine a torch very close to the surface of the screen while the laptop is on. if the back light is knackered you will...

have you changed any graphic card settings?