Can't setup any desktop image

[Guest Boki]

Hi All,

 

I forgot what I have done.. maybe adjust some video output between a

LCD TV and a LCD monitor.

 

One day, I saw my desktop image was gone, whatever I assging it and re-

setup it.

 

it just can't show up any image.. only pure background color....

 

 

Can you advise ?

 

Thank you!

 

Boki.