|We still need the model numbers of the Packard Bell Computer & Monitor. They should be written somewhere.|
My guess is this is a monitor fault, or there is some setting on the front of the monitor that keeps this square up. The only way I can see to help prove or disproving the monitor is at fault is to try it on another computer. It might even be worth trying another monitor on your computer.
Always pop back and let us know the outcome - thanks