The screen went dark and the power button is a steady yellow color instead of a steady green. a loud popping sound was heard before the button went yellow; before that it had been a flashing green button with the dark screen.

Pseroy, If you visit YOUTUBE check out the longer video clips of LCD monitor disassembly and repair of the most common type of failure modes that ALL BRANDS have. Whenever posting to this site it would be nice if we could also get a little bit of history-- like age of unit and approx total hours of "on" time. My best guess is that the "switch-mode-power-supply" has finally bit the dirt. Popping sound was the "electrolytic filter capacitors" venting to the atmosphere because they couldn't stand the heat in the unit any longer. In any case a tech should evaluate unit or if it is >3-4 yrs old look to trade in for new. also check web for swollen capacitors in lcd monitors and "cold-cathode-fluorescent-tubes" and their power source which is called an INVERTER circuit. Here is quick and dirty lesson. Monitor SMPS makes dc voltage for inverter (electronic ballast) circuit which makes 800-1200 volts ac to light up the CCFT's. You are dealing with something similar to the new screw-in curlie-Q CFL lightbulbs only their "ballasts" are dirt cheap and are called "converters" AC to AC. Hope this info was of some help. I'm louie12fix on fixya or lmistyrel @ aol .com please rate this response at fixya.