New Nvidia GT640 - black screen!?

Hi all :-)

I just bough a new graphic card (Nvidia Geforce GT640) because my old one is not relly working well for games like Assassins Creed 3 and so on.

However, when I plug it in I get a black screen right in the beginning. The motherboard doesn't "piep". Since my old graphic card (ATI Radeon HD 3850) is working properly, I think there is no defect in the RAM, motherboard or other components.

My current motherboard: MS-7255, Version 2.0

Power: Asus A-55GA; Max combined 528W

Do you have any idea whats wrong?

I really appreciate your feedback :-)

Thanks in advance!!!!

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