When you release that source at that moment of being used, power lite is on and steady not flashing, it will now default back to the signal loss screen saver mode within a few secs. When the power lite stays on and inserted into a source, the monitor has determined a source but no display from the invalid source it selected.
What is happening is the monitor is locked in a loop and will not release until the power lite stays ON constant with it inserted into a video card.
