My computer has a standard 15 pin, (5 pins in 3 rows) pc connection. The tv has component red green blue connection, with a red and white audio below it. I've purchased a cable that connects the pc to tv but the Windows welcome screen is the only thing that appears when I turn it on. I think maybe I need to change some of the computer settings, as it recognises there is a desperate monitor attached but nothing appears? Greatly appreciate the help.