Unplug AB-412 hub, start by unplugging all products from hub. Start one at a time by plugging in, power on again, check for blinking. Do this for all devices until a problem is found with one device. Typically this is a short between power an a ground. If it is back to normal, watch this closely as a surge from the power would have placed it in this state.
Recommendation: place power surge protector in line with the power supply