Problems with R9 270x install

[FallingPiano]

I have been trying to install a pair of new R9 270x cards into a gigabyte GA-Z77-D3H mobo (fully compatible with the cards, I've triple checked). Power supply is 850W so that shouldn't be the problem. The computer boots fine on the iGPU, but as soon as the cards are seated and powered the computer will not boot. It will power on, fans will spin up, but nothing will happen--no beeps from the mobo, no lights, nothing else. I'm in the process of flashing the newest BIOS to the mobo to see if that has any effect on it. I also have made absolutely sure that PCI graphics are enabled as primary in the BIOS.

Is there anything else I can try or something I'm forgetting? Really hitting a wall here. Thanks for the help.

 

[mdram]

check them 1 at a time?

 

[Danrr]

Install 1 at the time, make it primary then install the second one.

It sounds like a configuration problem, also check your motherboard manual to see which PCI slot is the primary, usually the top one but can vary.

Good luck

 

[FallingPiano]

Checked them 1 at a time, no luck. The computer isn't booting at all when they are inserted... no POST or anything. Checked and they are inserted into the correct slot. Anything else?

 

[Ranulf]

Just to double check, you have powered the cards directly from the psu as well right?

Awhile back while swapping out some hardware I told myself to double check the pci-e cables for the vid card as I'd removed it and still managed to forget to plug in the power connectors for it. Machine booted up fine but no video...

 

[FallingPiano]

I actually just got everything working. The solution was flashing the newest BIOS for my mobo. I believe the problem was that the cards were newer than the BIOS version that I had before flashing. Thank you for the help all.

 

[lyssword]

yeah it happens often, older mobos dont work with pci-e version 2.1 or 3 or whatever, and flashing usually fixes that