Hi. I just bought a used GT240 card off ebay for 720p gaming. Everytime I go to youtube or try to start a game, the driver crashes. I tried installing 5 different driver versions. Still crashes. I have a 250w PSU, so I tought it doesn't have enough power and I tried it in one of my friends computers that has a 500w PSU. It crashes in his PC too. Is the card broken or is it something else? 
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