Samsung 52 Inch LCD 120hz. 3 inch wide vertical... Hey, I have a 3-inch wide vertical line on the

Question

Hey, I have a 3-inch wide vertical line on the left side of the screen which remains on the screen while connected to the cable box and when not connected to the cable box. The Line does not leave the screen. The resolution on the 3 inch wide line is much worse than the rest of the screen, it reminds me of the way the old Windows 98 'Safe Mode' resolution use to look but its just on the 3-inch wide strip. Please help? is my t.v. defective?