I have an old 40 inch LCD TV - Proview PA-40JK1A model. The TV turns on and am able to see the Proview logo, the menu, the settings etc. However, when I connect a laptop via HDMI or VGA cable, I do see the screen resolution and refresh rate on screen, but I do not see any picture. I am familiar with using external displays and have tried changing different settings on my laptop and have also tried using different laptops. I wish I had a DVD player or cable to test those inputs, but I do not. Would appreciate any suggestions on how to troubleshoot further. Thanks!