Have a cinema monitor when I plug it in it does not power up, I exchanged the power adapter with a working monitor and that did not resolve the problem, therefore thought that it had to be a issue inside because the lcd light at the bottom right did not work. Removed the aluminum case to expose the rear of the monitor noticed when the power cord was connected to the working adapter that the green light at the centre of the logic board was flashing 3 short bleeps. Wondering if anyone as an error code for this. Also I reset the prms on my laptop and this did not help, I feel it could be an internal monitor issue.