Help. Radeon 7950 not working on Asus p8 z77-v LK

lunacake

Honorable
May 27, 2013
5
0
10,510
Hello. I just upgraded my pc. I bought a new mobo, cpu (i5-3570k), graphics card, and hdd. Everything seems to be working except for the video card. I'm using my old Radeon 6850 right now and that's working obviously. Both video cards are plugged in. The fan on 7950 is working but I get no display if I hook my monitor up to it. I'm not sure if the video card is dead/defected or my motherboard isn't detecting it. This is my first time building so I'm not sure what to do.
 
Solution
Regarding power consumption, the PS would not be an issue at idle (2D). I noticed you said both are plugged in right now? SO you have a large PS that has at least (3) 6 pin power connectors? Your 6850 needs 1 and the 7950 needs 2, correct? Unplug the 6850 and use the 6 pin power connector on the 7950 and swap them around to make sure one of your 6 pin power connectors is not the problem. You can even use a volt/ohm meter, just to verify the 12 volt output on the power pins ( there are three pairs of 12v and ground ). Just measure voltage, not amperage, the amperage will vary with load and your meter may not be able to handle the current. Make sure all of them read the same. If everything checks out then you can start assuming it...

avjguy2362

Honorable
Jun 21, 2012
732
0
11,360
Regarding power consumption, the PS would not be an issue at idle (2D). I noticed you said both are plugged in right now? SO you have a large PS that has at least (3) 6 pin power connectors? Your 6850 needs 1 and the 7950 needs 2, correct? Unplug the 6850 and use the 6 pin power connector on the 7950 and swap them around to make sure one of your 6 pin power connectors is not the problem. You can even use a volt/ohm meter, just to verify the 12 volt output on the power pins ( there are three pairs of 12v and ground ). Just measure voltage, not amperage, the amperage will vary with load and your meter may not be able to handle the current. Make sure all of them read the same. If everything checks out then you can start assuming it is defective. I would probably still want to try it at a friends in another computer, or call the manufacturer. My first 6950 was bad and I called Sapphire and we went over a bunch of tests and they told me to send it in!
 
Solution

lunacake

Honorable
May 27, 2013
5
0
10,510

lunacake

Honorable
May 27, 2013
5
0
10,510
I got it to work. One of the connectors from the power supply doesn't work. I found out when the 6850 wouldn't display when I used that connector. Every thing is fine now. Thanks.