I am trying to use my Hitachi CMPAS14S TV as a monitor for a laptop computer. I have connected the computer to the Hitachi AV2 input using a D-15 pin to 3xRCA plug cable. However I keep getting a "Invalid Scan Freq" message. I have tried different screen resolutions and different frequencies in my computer but this does not change the message. I have also tried connecting the computer to the TV using a D-15 to D-15 (RGB2 connection on TV) but get the same issues.