My monitor flickers for few seconds when turned on. After few seconds it resumes its usual image. The small green light of my monitor flickers too in the same time. I mention that it never flickers when used. I have a program that puts the monitor to sleep (the main unit still works) and when I want the monitor to exit the sleep mode flickers again for a few seconds and then it works well as usual. What could be the problem? Is it the cable? I've already changed it; I use a new one now. Is it the video card? Or it's just that my monitor is dying on me?