I have an HP DL320G5 that is displaying an amber light on the power button. There is a green flashing light where the power supply plugs in the back. I have tried a different plug in, different power cable, reseating the power to mb. There is two fans running on the supply itself and a green light on the mb but is not booting up. Trying to figure out if it could be the power supply. It is very expensive so trying not to order it if unnecessary. I have had power supplies go out on another server and several desktops but they always are just completely dead....no lights at all like this one. Any thoughts???? Thanks in advance.