Cannot detect my LCD TV via VGA

[tutituba]

Hi

I want to connect my Philips 37PFL5405H LCD TV to my computer which has ATI HD3850 graphic card using VGA (RGB) cable.
Catalyst detects the tv, i can set the resolution and some other stuff, but the tv always says "no signal".
Also when I connect just the tv to the computer there's picture on the lcd tv, but only for a moment, than it vanishes.
I'm using the latest catalyst.

Any ideas?
Thanks

 

[fishnbanjo]

A quick look at the .pdf of your manual shows your TV has a feature called Easy Link which is used to turn on and off connections to PC's using either HDMI, DVI or VGA connections, this information is on pg 49 of the .pdf which should be the same in your manual, suggest you read that section as it gives a workflow to get the connection working, good luck.