I have a K70 RGB mk.2 keyboard that is only a few months old. About half of the time when I turn on my computer, the keyboard backlight does not come on. I have to either unplug the keyboard and plug it back in, or power down the computer and reboot it to get it to come back on.
Huge pain, particularly having to get up and try to reach the USB plug on the back of the computer each time this happens.
Any thoughts on how to prevent this?