I have dead pixel in my screen too...
i have 1 white in the left bottom, and 1 in the center of screen (white in all colors and make me crazy)
its sux, indeed.
My audio have a problem too after att to 8.1, hes make a noise if vol, are in 100%...i live in Brazil so, its impossible to me contact te RMA or something...
if this notebook break, im ****ed. 😞