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cant log into laptop because certain keys dont work

Check the internal keyboard cable - usually just have to remove the keyboard surround or a few screws to pop out the keyboard. Make sure the ribbon cable is fully in the corresponding connector.
 
Ive been using the keyboard on screen, but its annoying that I can't just type, way quicker than the mouse pointer, it just happened today, the e key has stopped working completely and a look after my laptop!