Not the first time the keys c and b work. you need to hit them with force when other keys are triggered by a light touch. At this price, it's a shame. Check when shopping. p. S In the service center they said and showed that this is a key dominator 2 cant. When the backlight is on, c and b do not work correctly. Turn it off and everything is fine. only here it is interesting due to the backlight. and so - would take a different mechanics.