My K55 RGB KeyBoard hasn't been lighting up for about a few months now and I figured it was nothing so I just let it not light up. Now, since it's summer I stay up later and it's kinda hard to see which keys I'm pressing in the dark. Previously the RGB helped with this. I tried plugging and unplugging it holding ESC. Then I did it holding FN and F4. I opened iCUE up and updated it. It is still not showing lights. I've also clicked the little sun looking light button. Nothing works and the lights wont show. How can I fix this?