Have you verified that a single monitor works on each of the connectors? If not, you need to ascertain why before anything else. If so, have you also verified that these two connectors can be used independently? Some boards allow only one of the two connectors to be used.
Hope this helps,
Hi Scott thank you for your reply. Yes both monitors worked independently with both VGA as well as DVI-D.
i read somewhere that you cannot use the combination of VGA and DVI-D for duel monitors.
I plugged one monitor into my tower as VGA and the other in as HDMI and now everything works.