I don't see an onboard video port on your motherboard:

http://www.pricegrabber.com/search_t...terid=22169854

You sure it has a vga port ?

Your monitor doesn't look like it would have a DVI port while your video card looks like it has just DVI ports.

So you would need a vga to dvi adapter and its very likely they supplied one for you if they built the system. Shouldn't require you to move anything around or even open up the case.