I currently support about 50 GX280's and one of mines began to flash this amber light as soon as I plugged the power cable into it. I switched a power supply out of a perfectly fine GX280 and placed it into my pc that was blinking amber and that solved the problem. Just to verify that it was my power supply I actually placed the power supply that I suspected to be faulty into the working pc and that made the power button blink amber again and not power on. Tell me how this works out for you guys. Sorry to double post but I also removed an added on DVI video card, and converted to the intergrated VGA port before I swapped out the power supply.