Video card is dead

need some help i got the game alpha prime try ed to start it up and my monitor lost signal so i gave up on playing the game, now left 4 dead 2 ran fine so may be the game will messed up, the next day i get up move my mouse so that the monitor comes back on and there's a yellow line right across the monitor so i turned of the monitor and turn it back on and the line is still there so i restart the computer and the line goes away so it dose it again so i used the other dvi port on the video card and it didn't due it any more, well when i was watching an anime ep my monitor lost it signal so i installed new drivers and nothing the same thing, now 2 weeks a go i got an blue screen on my computer saying memory dump also after that i noticed noticed my frames we unstable in left 4 dead 2 some times is would fine and some times is was slow and hard to play, now i also unstable when playing that there was stutter when i was playing a lot which i never had before so is my card dead, it was an evga 9800gt , and a coolmax 500 watt power supply thats about 5 months old with 36amps on the 12v rail, not the best but works, my friend used one to power an 9800gtx + just fine, now for my other question i am really low on money and was think of getting these cards i play at 1280x960 all the time my friend gave me an 7200gs and well thats crap can't even run cs the best i can do is 1024x768 now will any of these cards let me play at 1280x960

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...


http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...  

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...