SL-DVI-I and DL-DVI-D ports graphics card

Hope someone can answer this: I have a XFX Radeon HD 6670 1GB, DDR graphics card with 2 ports (as noted in the subject.) I am able to get one monitor to display from the DVI-D port, but have tried 3 different monitors on the DVI-I port and none would identify or work. I bought an AVG to DVI-I cable and tried that, to no avail. I am really believing that the left port (DVI-I) is bad and I should get a new card. I do not know of any other way to 'test' it. I wanted a simple dual monitor set-up. I appreciate any help you can offer.

Might be an obvious question but have you enabled the second monitor in Catalyst Control Centre? Also what resolutions are the monitors?

Thanks! No, I have not enabled in CCC. I didn't know if it was installed with the card or not. I was incorrect in my description of the working and "non-working" ports on the graphics card. I had them reveresed (they're not labeled on the card itself and I was looking at the picture on the box.) Apparently, the one port, the DVI-D port will only accept digital and I had an analog VGA cable on my LCD monitor. The DVI-I port will accept either analog or digital. I called the graphics card manufacturer and they were helpful. I have downloaded CCC, but have no idea how to use it. The LCD monitor is 1680x1050 and right now, the CRT I have hooked up is 1280x1024. I may replace this old CRT down the line with a like LCD, but have become used to doing my Photoshop work on a 3:4 screen, rather than wide screen.

In CCC go to Desktop Management -> Creating and Arranging Desktops and extend onto the second monitor.

Thank you so much for your reply. I just hooked up the DVI-D cable and I now have both monitors. I extended desktop and am thrilled...after a week of insanity and trying every hook-up imaginable. The problem seemed to lie in the DVI-D port that would only accept a digital signal (and my older cable was VGA to digital.)

Glad to hear you got it sorted. The D in DVI-D stands for digital only... well at least now you know.