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I got an Asrock 945GCM-S motherboard, LGA 775 socket, 4GB of RAM and a Core 2 Duo E7400 processor. And I wanted to upgrade my graphics card. The older graphics card was a Radeon HD 4650 without its own power supply, so now I bought a Radeon HD 7770 graphics card, and here are the problems.

First when I inserted the card and booted up, I could hear the speed of processor's fan was going from like normal to slow, back to normal and slow again. So I figured it was the PSU. I bought a new one, 150 watts stronger than the original one. A bit better, but still not good. So I bought a new In-Win GreenMe 750 Watt PSU, with four separate +12V, 25Amps. The PSU came out of a computer that was light-years ahead of mine, so it should work.

I set up everything, and here is the problem. The computer starts up normally, (the fan speed still goes up and down, but the speed change is not that obvious anymore, BUT I still do not get any picture from the HDMI or DVI or the VGA connectors of the graphics card. It seems like it is not recognizable by the motherboard.

I tried upgrading BIOS, no good, I still have one option of upgrading the BIOS, but it is like experimental. It seems that Gigabyte has similar motherboards, except theirs is called GA-945GCM-S2C and I don't know what that 2C stands for and I am a bit scared of bricking the motherboard. So my question is: what is there to do, cause I am lost? I have an option to buy another motherboard, but regarding that I still do not know if it will recognize the graphics card (MSI 7352 Q33, LGA 775).

Any help would be very appreciated.

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Your system memory speed and your video card memory speed shouldn't have anything to do with each other. –  Journeyman Geek Dec 16 '13 at 8:24

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