Question about mobo without onboard video

[acolyptus]

Hey guys, I just assembled a new PC, all is working well except for the fact that it won't display. It's a mobo without onboard video, so I plugged in a video card (with PCI-e riser cable) and connected it to the screen by HDMI cable, but I don't get a signal. Now what I usally do is that I just run it through the mobo's onboard video card first, install the drivers for the graphics card and then I get the signal, but in this case I can't because the mobo doesn't have onboard video graphics.

Anyone any idea on how to get this running?

Cheers.

 

[noidea_77]

Please post the exact system configuration and why you use a riser card.

 

[acolyptus]

MOBO: 990FXA-UD5
Graphics cards: Radeon r9 290 (3x) with pci-e risers (cables)
Processor: AMD FX black edition

The reason I use riser cables is because I want to use this rig for mining, so it's not in a normal computer case. The graphic cards are working, since the fans turn on. The reason I know it's the drivers is because I'm using these exact same cards in another rig, but with an onboard graphics card and that's where I plugged the HDMI in to get display for the first run.

I'm thinking that I might need to use another cable for this because HDMI requires updated drivers (I guess), would plugging in a DVI-D cable help?

 

[noidea_77]

The problem are the riser cables! These cables don't work (at least not with high performance cards), because PCI-E is not specified for it.

 

[acolyptus]

Putting them directly in the slot doesn't solve it either, so it's not the riser cables I think.

 

[giantbucket]

you have THREE cards, or one? I'm assuming three cards.
what's your power supply spec'd at?
what happens if you only try one card at a time?

 

[acolyptus]

Three cards giantbucket. It's a 1200 watt PSU. I tried putting just one video card in a PCIe slot directly (without the risers) same result.

 

[giantbucket]

hmm, assuming that you've got the PCIe power connectors hooked up, I'd try the DVI port but then again I had the same board (UD3 version), and was able to plug in two 7790s with 6 monitors (DVI,DVI,HDMI on both cards) without any issues at all. so you might have a bad mobo OR a bad cpu.

and it never hurts to check all power cables - 24pin mobo, 8pin mobo, PCIe, etc.

 

[acolyptus]

8 pins connected, 24 pins connected, the PCIe power is connected and the CPU fan is connected. Aren't 7790's different cards tho? The thing is, the other rig that I just hooked up had the exact same problem (no display through the cards with HDMI cable) and that one has a different CPU and MOBO. So I am pretty sure it's a driver issue with the card that it's not able to display anything with a HDMI cable, not even the BIOS.

 

[giantbucket]

yeah a 7790 is different, but still worked without a hitch. try the DVI connection instead, and if you have a different lower-end card kicking around try it instead (maybe even as lowly as analog VGA connection)