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Second graphics card slot not working

Mthr

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Second graphics card slot not working
« on: April 13, 2013, 01:14:20 am »
Hello and greetings everyone, on march the 19th of 2011 I bought a P67-A-UD4 gigabyte brand motherboard.

I have now recently gotten a second GTX570 (one of the 570's is asus and I'm not sure the brand of the first one I got).
Upon trying to SLI the lower graphics card slot slot in which the graphics card is put into doesn't appear to work, I tried both graphics cards in the upper most of the 2 slots and they both worked but they both are unresponsive (turning on but giving no output signal to my monitor when plugged in) on the lower slot.

Can anyone here help me address this unfortunate issue?
Any more details required will be provided upon request.

-Thank you for help in advance