Monitor used to work fine in a PC. PC did not work any more. I tried to use the monitor in another PC of my children -a Pakard Bel of 2006-but monitor is on -there is a green light in Power, however the screen do not show anything, it is completely black. I press the buttons for auto, menu, up and down, but the screeen remains completely black. What happened? How to mend it?

Antonio, October 2010