No. Widescreen monitors should work just like 4:3 aspect ratio monitors. Two possibilities that I see here:
1) Bad VGA cable. If you can borrow one from a friend (or have a spare) try a different cable.
2) Bad VGA on the motherboard. Check to see if you can borrow a graphics card from a friend (if you don't have a spare around). Install it, connect it to the monitor using the VGA cable (you may need a DVI to VGA adapter) and see if you get an image.