Didn't get a chance to see what type it is yet, it just died this morning.

Picture was fine, then I heard a click / zap sound and the picture jumped. This happened a couple more times, then the screen went dark.
Now all I hear is a fast clicking sound, no picture, no neck glow (as far as I can see).
Any ideas what to check first based on these symptoms? This has been a perfect monitor until today.