Hm, i don’t suppose that card requires a separate 6-pin power connector from your PSU, does it?
Any VGA with two DVI/VGA outputs will allow you to use two monitors. You can even buy a card that has one output and buy a DVI/VGA splitter, like this
Most new cards already come with at least two output though…
Hm, according to your motherboard’s manual, a long beep followed by a short beep indicates a problem with your memory or motherboard. I’m guessing your PCI-e port is messed up. I would try and install the VGA on another computer to truly understand if the problem lies within the card.
If you find that the card is not functional, i would buy and test out another card that has two DVI or HDMI ports. Otherwise, you can buy the splitter, as mentioned before, and use it on the integrated graphics card.
It seems like it was the graphics card. I found an ancient QuadroFX 330 (which has a special port and VGA splitter) at work, downloaded the legacy drivers, and BOOM, 2 monitors. I’m tempted to see what happens if I hook up a third monitor to the on-board graphics card now.