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When I turn on my pc (cold start) my video card (Gigabyte ATI 5850) makes some weird fan-noises ... like it doesn't have enough power. I have replaced my Antec 450W with an Antec 750W TruePower (brand new), but this did not solve it.

I've made a video of the boot up process. Please have a look/listen.

What is weird, is that if I ignore that boot up error, I can run windows ok.

Can anyone help? Suggestions?

Motherboard is an asus P5N-EM HDMI (if that helps).

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Have you connected the 6-pin PCI-E power connector ? – Sathya Aug 8 '10 at 7:46
    
yep. if you looked at the video, the card has 2x 6 pin PCI-E connectors and I've shown that in the video and even said that in the vid. – Pure.Krome Aug 8 '10 at 9:52
    
are they on the same rail? I remeber when I installed a new gpu it stated that the two pcie 6 connectors had to be from different rails. just check that they dont connect to the same cable going back to the psu. – Tim Alexander Aug 9 '10 at 10:05
    
no idea. My psu has two PCI-Express plugs .. which i used to plug into the top of the GPU. – Pure.Krome Sep 25 '10 at 9:44
1  
Does the computer post with a different graphics card? Does the graphics card work on a different computer? – aCuria Mar 4 '11 at 21:49

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