As the title suggests, my K70 (non RGB) is completely unresponsive and I'm want to see if there is anything that can be done to fix it!
Yesterday I decided it needed a bit of cleaning so I took all the caps off and washed them off in water while I went about wiping and dusting off all the crap that gets between the buttons.
I left the caps to dry off and later thoroughly wiped them clean to make sure there was no water left on them before I reattached them.
The keyboard worked fine for the rest of the day (several hours), but when I started the computer today the keyboard was completely unresponsive, no LEDs light up, nothing.
I feel that it's very unlikely that any moisture got in it as I really made sure everything was dry before I put it back on, but it's the only explanation I got :/
It sounds like you were really careful about the moisture.
Are you sure it's not something silly like the a cable came loose? Also try different USB ports; sometimes Windows will disable a port until next reboot, if it notices sometimes odd about the port.
Hey I'm having the same problem. My K70 worked this morning. When I got home from class the lights were on but the BIOS wouldn't recognize it. I unplugged it and plugged it back in a few time and eventually the lights went out and now it is seemingly dead. I've had it for just over a year. I'm going insane trying to figure out what is wrong.