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Looks like heat related problem on two possible areas.
1. The LCD monitor itself, probably a cold solder or overheated capacitor either in the power supply or inverter circuits; or
2.
The video card heatsink isn't getting enough ventilation. If it's got a
small blower fan, it might be stuck, burned out or simply clogged with
dust.
You would need to open the units for a look and see.
Dear thanks for replying...!
Actually I forgot 2 write that: Fan of the Card and the LED on the card works fine, even I tried keeping my cabinet fully opened.
But this does not work.
Other solutions you can suggest. I'll try them out.
once again thanx
