Please reinstall or update display driver error for nvidia gts 250

[ladydiscotheque]

Hello,
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???

 

[rolli59]

Did you connect the power cable to the plug on the card itself?