Way back in 2007, my family got two ViewSonic VG2030wm monitors, one for me, and one for my parents. At the time, they were great screens, fairly high-resolution, nice color reproduction, etc. On my monitor, after a year or two, I'd notice the monitor would start to flicker when something dark colored or black would be displayed on screen. The solution was to bump the brightness down to next to nothing. Not the best solution, but it still works (I'm using it on my main desktop to type this post).
My parent's screen has been acting up lately, now. For the past few months, whenever their desktop (running Windows 7 x64) would wake up from sleep, the screen would stay black for a few minutes with only the monitor's LED flashing blue. The computer was awake, as you could still blindly click around and hear Windows 7's various notification sounds. Normally after a few minutes (maybe 10-15) the monitor would finally turn back on. Today it never came back on. I thought it was probably a driver issue with their computer, so I grabbed a spare monitor and it worked right away.
Decided to attach the ViewSonic up to another PC, and I'm still getting the flashing LED power indicator and if you look closely enough, whenever the power LED flashes you can see the monitor's backlight flash on and off. Something tells me the screen's probably dead, but I'm not 100% sure. The troubleshooting guide in the monitor's manual and ViewSonic's website doesn't mention it. Anyone else experienced something like this before? Probably time to replace the monitor.