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Solve : HP LED unusual display issue?

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I am working on a HP g7-1167dx WINDOWS 7 Home Premium. The LED display backlight keeps TURNING off after a few hours with images. External monitor ok. No inverter on this computer, replaced complete LED SCREEN twice and still same problem. Reinstalled drivers and updated BIOS as well. Only thing I can think of is a bad cable from the motherboard to the screen but is just real random when it turns off. Screen will light up by itself after 5 - 10 minutes, usually on restart will b fine. Any help would b greatly appreciated. No errors detected. Running out of ideas. The cable would be the next thing to test



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