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On your remote control, press MENU.
Highlight Settings with the down arrow button, then push OK.
Press OK after highlighting Television with the down arrow button.
Select TV resolution, then click OK.
Select HD 720p, HD 1080i, or HD 1080p using the arrow buttons.
Try to powercycle the tv by unplugging then pressing the power button and hold for about 1 minute. Once you have done that replug and see if it works. If not, most likely is a mainboard issue. There is a kit available for repair here that you can use that includes all of the parts so you don't have to waste time trying each one at a time. http://digipartsdirect.com/listKits.php?brand=Funai&SId=3
Adjust the computer resolution to 800-600 and set the lowest bit rate, ie not 32bit. 24bit or 16bit will be fine. To do this right click on the screen and choose properties, click on settings and you will see the slider bar the resolution and the drop down menu for the bit rate. The reason you have to do this is because even though its a tv it works on a lower resolution than a computer monitor and is unable to show higher res.