When I turn on the monitor, the green led will come on and stay on. I will get a signal for about 1 second and the screen will go black. The led indicator will stay solid green indicating that the monitor is on. I am guessing it is a monitor problem becuase it doest the same when the vga cable isnt plugged in. I see the box that says no signal but it dissapears after one second and the backlight goes off.