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I have a dell latitude E6420 and it was working fine until last month I encountered a very strange problem. My laptop's keyboard stops working as soon as I exit the bios startup screen. Like, I can enter setup etc by pressing F12 and stuff but after I enter the bios menu, it just stops working for no reason. I have tried reinstalling windows and drivers but nothing seems to work.
Have you tried another (USB) keyboard? – DavidPostill – 2016-03-03T18:03:26.427