How do I know if my graphics card is working good or starting to spoil?

First of all The VGA port stop working, Facebook games lag like hell and another thing the graphics card fan could have been heard when the computer start but not again, on the positive side I running Call of duty modern warfare 2 on maximum graphics. nvidia gt220 1gb ddr2|||Hi

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Thanks|||try and update drivers . also if you have another available slot on your motherboard to put your video card in try switching it. but first try updating your drivers from nvidia.com. if call of duty runs with out problems I am sure your card runs fine , the facebook games might be a shockwave or flash update too.|||if ur graphic card not working good when u watch a picture or video it blurry !