Can't get my dell e156pfp monitor to turn on. The power button stays amber. Message on screen says it's in power save mode-press power button- any key on keyboard or move the mouse to turn on. None of these worked, even tried another monitor I got no signal on it. This happened after trying to turn computer and getting flashing green lights on the power button and diagnostic lights. I hooked up a new power supply and all lights are solid green but the monitor won't turn on. Can anyone explain in novice terms what I can do to fix this problem? I can't make any changes to monitor or computer because I have nothing but a black screen. I've seen several post on this but nothing that seems to totally apply or that I understand.