Hi. I am having the same problem like Nathan. I just bought my Gyre XF230 with just one pump. Bought it with Dr. Foster and Smith. It arrived on Oct 23rd and installed it immediately. I was so happy and excited to see it how it was performing very well in my tank. Checked the following morning Oct 24th, before going to work and it was still working beautifully. However after arriving home from work I noticed it was not working. NO water circulation nor gyre motion. The power supply unit has blinking green light and the Controller Unit is off and has no settings nor showing any digital settings. I attempted to press the modes botton but no avail. I tried unplug and replug, and used different outlet, still NOT powering on nor functioning. Please advise.