A new (2 month old) st2210b changes colors to blue and yellow. There is no rhyme or reason as to when that I can detect. I thought it was the monitor so I brought it back and exchanged it but this new one is doing exactly the same thing. I am running XP on an Gateway 4016. Could it be my graphics card?? I am getting very frustrated. Dell support has been unable to help so I am hoping someone out there has a suggestion.