When it's turned on, the light on my monitor blinks but the screen doesn't display anything. Why might this be happening, and how can I fix it? It's two years old and it worked fine until today. I always keep it on, but today I turned it off and when I tried to turn it on again, it didn't work. PC works well with other monitor.I unplugged the vga chord and plugged it again. Also, the light flickers when I turn power on, even if PC is not on, which makes me think that might be a problem with either something in the monitor or, perhaps, the switching adapter.Monitor usually had a fixed green light when working and a fixed amber light when pc was shut off, after displaying a "no signal input" sign