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Computer crashes every time i try to start a game after installing new graphics

Last response: in Graphics & Displays
September 15, 2012 9:19:59 PM

last week i purchasd a sapphire radeon hd 4870 x2 2gb gddr5. i had to buy a bigger case and bought a 750w power supply to install it because of its size and power connectors.I am running windows 7 ultimate 64bit with a core 2 duo 2.5ghz,8gb ram on a asus p5g41c-m lx motherboard. i was running a palit geforce gt 240 before with no problems but now iv got the new card in it crashes every time i try start up any game. ive updated my bios,installed the latest graphics drivers and software and rienstalled them.ive updated windows,my chipset drivers,audio drivers the works. please can someone help ?
September 15, 2012 9:31:44 PM

How many power connectors did you connect to the card from the power supply unit?
September 15, 2012 10:02:07 PM

did you delete the old drivers?
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