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First Press all the keys on the keyboard (computer on or off)a sweeping motion accross all keys will do, A stuck key can prevent windows from booting (seen as a keyboard error).
it is also possible that your keyboard connector has come loose, check the keyboard connector (you will need to remove the facia above the keyboard and may have to undo a couple of screws to do this).
could try to plug in an external keyboard, see if this allows you to bypass issue