I followed the manual but I still couldn't open up the lid but I occasionally found out that pressing cap lock key twice could stop the random input. I'm using this method to clear the internal keyboard's input now.
Any updates lok kwok? I'm hoping you were able to fix the keyboard.
I can't remove the assess door because screw just can't be loosened.. I'm using a usb keyboard as well as an on-screen keyboard to type now.
You can contact Technical Support for further assistance in link below. Hopefully one of the Dell rep or another person can charm in and be a help to you.