I cannot change the color of my Challenger Prime keyboard to purple. It doesn't work by the function keys on the keyboard or by using the Thermaltake software on the Advanced tab. I can change to blue or red and when the cycle should change it to purple it stays red. I've only had this keyboard for 3 days. The first 2 days I had it, purple worked fine. I've tried doing the reset in the Thermaltake software and that did not help. Rebooting the computer did not help either. Please advise.