X58 PRO won't boot (memory or video card issue???)

Hi all,
this is my first message here.
I have recently bought a X58 PRO motherboard to which I have connected the following devices: one HD, one DVD, the CPU (i7 950), one Video Card (GeForce 6600 pci-express) and three DDR3 modules from Corsair (named CMT6GX3M3A2000C8). According to Corsair website the modules CMT6GX3M3A2000C8 run on thie X58 PRO.
I have turned on the system, but the screen remains black and the motherboard issues an intermittent buzz sound.
Besides:
The led close to the pci-express (where the video card is connected) is on.
The 5 CPU leds are all turned on.
The led close to the memory socket is off.
As far as I know, usually the intermittent buzz means that the motherboard doesn't recognize either the RAM or the video card, but I don't know if the buzz is different case by case (can be buzz be different according to the issue?) and in the manual I didn't find a troubleshotting chapter.
Is there a way which allow me to better identify where the issue would be (in memory or in Video Card... or something else)?
I have not tested neither the memory nor the video card on another system, thus I don't know if one of them is faulty.
Can anyone please help me?
many thanks in advance!
Lorenzo

Quote from: Bernhard on 27-April-11, 16:06:04
Do a CMOS clear>>Clear CMOS Guide<<
Only insert one mem module. Check all your power connections to the board/s again that they are secure. You may want to reseat your CPU and check carefully that all the contact pads on the CPU do have imprints.
Ok, I'll try it this evening!
In the meanwhile, I thank you.

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    Welcome to the forum!
    What machine and OS are we discussing here to begin with?
    Cheers,
    George
    In daily use: R60F, R500F, T61, T410
    Collecting dust: T60
    Enjoying retirement: A31p, T42p,
    Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
    Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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