Please reinstall or update display driver error for nvidia gts 250

i've instaleed NVIDIA GTS 250 (with Gigabyte mobo). but when i restart the pc, it says "Your NVIDIA graphic card is not receiving sufficient power. As a result,the graphic card has lowered its performance to a level that allows......." What should i do next???
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More about please reinstall update display driver error nvidia
  1. Did you connect the power cable to the plug on the card itself?
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