Hi, I'm very new in this forum and also mac experience, please help me this: I have a MacPro 3.2 GHz 8-core, I've just got Nvidia Quadro 5600 from eBay, seller said it's brandnew and a Mac version. I installed and followed their guide. When I turn MacPro on, immediately the sound "Beepp" is so loud and continute, it scared me then I turn it off. So what happened? Does the card have problem? Or my Mac? Is there any way to solve this? I've save money for long to buy the card, I appreciate if you can help me! Many thanks!