I have a Lacie Electron 22BlueIV monitor (CRT). Last night while I was watching a TV show on it, the screen went to black but the audio continued. I jiggled the mouse and pushed a few keys but the picture wouldn't come back. I shut the computer down and rebooted. The picture finally came back but for only a few minutes. This happened several times before I finally shut it down for the night. I did notice that the monitor was getting very hot, but I've had this device for a few years. Today it seems to be working fine, but it could happen again.
I'm assuming that if something blew in the back, the picture would not have come back on at all. This is the best monitor I've ever had, so I'm not looking to replace it.