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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. So i've just replaced my Antec 450W with an Antec 750W TruePower (brand new). Installed it .. and i'm getting the same problem.

So 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
    
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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