how do i connected my computer to my lcd tv i have the vga cable i hook it up but no luck i also change the source on the remote to pc the tv just say serching for singal the it go blank

You need to configure the display properties on the pc/laptop to go to the 2nd monitor which is what you tv is.

fisrt connect the VGA input connector from your TV to the VGA ouput terminal of your laptop (16 pin holes), and set the TV to PC source if you are using laptop with vga output just right click your mouse in the blank area of your desktop (new window exist) look for the properties, under the same window named display properties select the "settings" at the lower right area you'll see and click "advanced" . inside that area youll see the configuration for your tv connection if you use it as extention or main..

for desktop use you can connect drectly the VGA connector to the VGA terminal at your Desktop PC, thats it if you use your TV as your new monitor, but you want your TV as another monitor you'll need new hardware (video card) for new connection then the set-up the same as the laptop.