So how can I ask the question again, so that I get the answer ... In your reply you copied a section from the users manual that states "NOTE: When a device is connected to a headphone jack, the speakers are disabled."
That makes me believe there are indeed speakers in the monitor. But as in all assumptions, I'm trying to get clairification on this. BECAUSE ... with nothing attached to the headphone jack, the Speaker DO NOT WORK in the Monitor. When I turn the monitor upside down it appears that their is two vented areas that presumably the speakers are located, but I can't see them. I am trying to ascertain whether or not this monitor is defective, as the speakers are not working right out of the box. Please note once again, that if I do plug speakers or headphones into the headphone jack on the monitor I do get sound through both those device, so an audio signal is reaching the monitor, however when I disconnect them from the headphone jack port that according to your "NOTE" above, should enable the monitors on board speakers. However that is NOT the case as I get No Sound. Can I conclude by this, that the Monitor has a hardware problem?