My 20" Cinema display doesn't light up. It flashes 3 lights: short,long,short, which I believe is the error code associated with having the wrong power supply plugged in. Display has worked fine for the last few years and this is the power supply which came with the display. The periferals (keyboard/wacom) are getting power and the display doesn't work regardless of if they are plugged in or not. The display was working fine, then the powerstrip it was plugged into was switched off accidentaly. Now it no longer functions. I don't know if the power cord is dead or the brick, but some power must be getting through....please help!