The solution was, that I discovered, I gave a hard look at the computer screen when I turned on the CPU, found out that I had to plug in the add-in graphics card, so I followed and got through, and installed the Ati driver ended up with few minor issues, which I upgraded the OS system to Vista Business OS from Windows XP Professional SP3 (Still have the CD though) and fixed the minor issue then the ati drivers was successfully installed - finally. Then I restarted the computer, then I plugged in back the primary monitor with DVI cable, it worked, then I plugged in HDMI cable to my TV, it worked. Now I have discovered that I only need a HDMI to DVI cable for the second monitor which I obviously ordered earlier this morning. The tech support from Dell was wrong, I knew it was. Now, I am temporary using the TV as a second monitor until the specific cable arrives tomorrow or at least early next week. Problem solved (and VGA cable free!)