black screen with a new graphics card! installing in a system build that runs fine

isaac_

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May 2, 2014
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system..

i7, 3.4 on 1155 socket
16gb ddr3 ram
corsair rm850 psu (just got today)
msi b75ma-p45 mb
and upgrading from a gtx 630 to gtx 760 non reference
running windows 8.1
i did but the computer as a whole machine and plan upgrading everything when i have the money.

everything is working fine nothing is too warm or cutting out. but when i swap over to the new card and plug the 8 and 6 power connectors in and boot up i get a black screen. i know it successfully boots up as i set it to connect to the internet when it signs in(does automatically) and the fans spin on the card. here is the problem i have sent it back to the place where i got it from and its showed no problems for them, or so they say. also i am tried using a dvi-d and hdmi cable that is both compatible with my card and 1080p monitor.

i have tried lots of this like update bios and reset cmos. i cant try it in a other computer, or a different slot on my mb as i am waiting to upgrade when i have the spare cash.

please help as i cant get a full refund from the company and i don't want to loose out.
 
Solution
turns out on windows 8 they have a fast boot option in bios if you disable this it will scan for new hardware and find the new graphics card

isaac_

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May 2, 2014
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thanks for the reply! what should i do then try some new cables? what did you do?
 

isaac_

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May 2, 2014
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if i am using my on board graphics dvi works for me is it worth getting a cable