I'm posting this thread so that future inquiries of this type might be able to figure out what's up.
I also took some pictures.
Someone had an FM1 ITX board with a DVI port, and a DVI monitor, and a DVI cable. And they wouldn't work together.
Well, as it turns out, there are different types of DVI ports and cables.
Here's a good reference site:
The most common, are DVI-I ports on video cards, and on motherboards that have both VGA, DVI, and HDMI, the DVI port is usually DVI-D.
Well, if you are using a DVI-I cable, it WILL NOT plug into a DVI-D port without an adaptor.
This is because the DVI-I cable has four pins around the "blade" for the analog video signals, and the DVI-D connector on the motherboard lacks those sockets and signals, so you can't plug it in.
You must use a DVI-D cable (more common) to plug into a DVI-D connector on a mobo.
You can also plug a DVI-D cable into a DVI-I port.
Here's some pictures:
1) Mobo with DVI-D port. Note no sockets around the "blade" part of the connector.
2) Video card with DVI-I port. Note the sockets around the "blade" part of the connector.
3) DVI-D single-link cable. Note the lack of pins around the "blade".
Sorry, I don't own a DVI-I cable to show you a picture of.