L850 Black screen but ok on external ?

Hi everyone,Got an issue that if in the biosBios-Advanced-System Configuration-Boot Mode = CSM the LCD screen remains black on boot.How ever if you plug in an external monitor you get full display on external only.If you change it Bios-Advanced-System Configuration-Boot Mode to UEFI Boot you get the LCD working again. WHy is this? I want to boot windows 7 instead of 8 and it wont load under UEFI. I have done a full reset of the bios to default and even removed the CMOS Battery, but i get no joy Anyone can help me ?

OK peoples, heres a link to a video i made showing the problem and how windows 8 and 7 will do a fresh install but bios will not display on LCD when in CSM mode. https://youtu.be/lhsNk4Cn7Dg

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L850 Black screen but ok on external ?

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