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

Hello,
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 ?
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More about computer crashes time start game installing graphics
  1. How many power connectors did you connect to the card from the power supply unit?
  2. try to reseat the GPU. I had the same problem after installing a new GPU, every game was crashing. Removed the GPU and installed it back and everything seems to work fine now.
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