I occasionally observe the display of LCD monitors turn black then blue as they enter power savings mode. This appears to be the regular behaviour of many LCD monitors.
As the bright blue screen sometimes hurts my eyes, particularly in a dimly lit environment, I wonder why the vendors did not choose some other, more decent color? And more generally, why would the displays not silently enter power savings mode without any vivid behaviour?
Here's an example of one such monitor - an ASUS VN247 series. Note: Though the phone-cam didn't show this well, the screen is actually the same shade of blue all over (the shade seen on the outer edges), except the boxes in the middle. Inside the inner box, it says "HDMI1 NO INPUT". Upon loss of input, the monitor goes black for a couple seconds before displaying this screen for a couple seconds, then it goes to sleep.