7970 Ghz no signal detected on boot with 8 pin and 6 pin, boots fine with only 8 pin

[Aotengs]

Hi guys,

I just finished my first build and have a bit of problem. The computer boots up fine to the bios with all fans spinning and everything when I have only the 8 pin connected to my XFX 7970 Ghz card, but when I connect both the 6+2 and 6 pin to the card, my monitor shows no signal detected.

I had believed the gfx card requires both 8 + 6 pin connections? Also note that I read on a review the card may require 2x 6 pin connectors, but when I tried only using the two 6 pin connectors, I get the same no signal detected error.

The PSU is an Antec 520W modular with 2 6+2 pin connectors split from the 1 cable.

Is there something wrong with my graphics card? Or is the PSU simply not compatible with that card? I'm a bit lost here.

Cheers for any advice you can give me

 

[Smoblikat]

Sounds like a PSU issue, can you check with another unit?

 

[Jaydip]

I would advise against running the 7970 from a single 8 pin.Do you have any spare card which can test this 6 pin cable?

 

[Aotengs]

I don't have a spare card nor another PSU unfortunately

 

[Aotengs]

I forgot to mention that when I have both the 8 and 6 pins connected, all the fans are spinning, there is just no signal detected on the monitor

 

[Piotrsama]

The PSU is an Antec 520W modular with 2 6+2 pin connectors split from the 1 cable.

Is there something wrong with my graphics card? Or is the PSU simply not compatible with that card? I'm a bit lost here.

What if you switch the 6+2 connectors?
Might help you troubleshoot.

 

[3DVagabond]

What if you switch the 6+2 connectors?
Might help you troubleshoot.

+1 :thumbsup: A short in the connecter could be the culprit.

 

[Aotengs]

I just found out I made a pretty big FUBAR.... Turns out I had plugged in the hdmi cable to the integrated graphics port on my mobo and not the gfx card itself. I have work now so I won't be able to test it plugged in to the gfx until tonight... but do you think that might have been the problem why it wasn't posting when I had both pins connected to the gfx? Something to do with the mobo trying to get display from the card since all the connectors are in, but the cable was in the integrated port

 

[alphascout]

you should be g2g when its plugged into the gfx card unless there is something else wrong but don't try to run a 7970 on one 6pin.

 

[Kenmitch]

I just found out I made a pretty big FUBAR.... Turns out I had plugged in the hdmi cable to the integrated graphics port on my mobo and not the gfx card itself. I have work now so I won't be able to test it plugged in to the gfx until tonight... but do you think that might have been the problem why it wasn't posting when I had both pins connected to the gfx? Something to do with the mobo trying to get display from the card since all the connectors are in, but the cable was in the integrated port

Some motherboards disable onboard video or give 1st priority to the pci-e slot when both are detected. Removing the 6 pin disabled the 7970 that is why you had video.

Swapping the hdmi to the 7970 should fix your issue.