Graphics card crash

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Hello, i recently built myself a gaming computer, and bought Half-life 2. the game opens and loads fine, but then as i am playing it will freeze for a few seconds then my monitor will say "no input from rgb", this is a regular thing but it does not happen at any specific point in the game, sometimes i can play up to about 20 mins and sometimes i can take 1 step forward in game. i have never had any issues with any other games. i have all the settings in game on the lowest possible. I have no ideas what the problem might be, i have tried all the standard things such as updating graphics drivers.

my pc spec:
Amd Athlon 64 X2 4200+
2gb of ram
Ati radeon hd 3600 512mb
and i'm running windows xp home SP3
650watt psu
 
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