Hi, I got the Ultimate Quickfire (brown switch, red led) back in December 2014 and I've had this problem with the keyboard ever since. Sometimes when I boot my PC the keyboard doesn't start up, no LEDs, no response. I have to unplug the USB cable and plug it back in (usually into another USB port) to get it to work. I read on another thread for the Rapid-i that there is a firmware update that solved the same problem for that keyboard, but there doesn't appear to be any drivers for the Ultimate Quickfire? Can anyone help? Windows 8.1 (updated) AsRock Extreme 6 Z77 (latest bios) 2600k 3.4GHz Corsair Vengeance 16GB RAM Also happens in other computers but I don't know what their spec is.