New PC Won't Boot With GPU Plugged In

[jasonz50]

i5 2500K
Asus P8Z68-V
G.SKILL Ripjaws Series 8GB DDR3 SDRAM DDR3 1600 (PC3 12800)
Crucial 128 GB m4 2.5-Inch Solid State Drive SATA 6Gb/s
XFX Core Edition PRO650W
Cooler Master HAF 912
Cooler Master Hyper 212
Cooler Master 120mm Silent Case Fan 4-in-1 Value Pack
Sapphire Radeon HD 6950 2 GB DDR5 DL-DVI-I/SL-DVI-D/HDMI/DP PCI-Express Graphics Card 100312-3L
Samsung 12x BD-ROM/16x DVD Writer Drive - Retail SH-B123L/RSBP (Black)
Sounblaster X-Fi

I hooked everything up yesterday. Upon booting the fans spun up weakly, and no video/POST came up.

After some limited troubleshooting, it turned out that unplugging one of the PCI-E power connectors from the video card started the fans going and the PC came to life.

I can leave one power cable plugged into the GPU and it will boot fine, but I only get video from the motherboard GPU, not from the 6950. As soon as I plug the second power connector into the 6950, the fans get quiet and the original problem returns.

Could it be a bad GPU? PSU? Something obvious that I'm missing?

Thanks.

 

[jasonz50]

Ok, so I feel like a bit of an idiot.

I had the DVI connector plugged into the wrong port. Now everything is working.

However, the fans still slow down tremendously with the GPU fully plugged in. Is this normal? That's really what was throwing me off.

Temps seem fine for the moment, FWIW.

 

[denis280]

is the card in properly.is the plug from psu ok.

 

[denis280]

is the card in properly.is the plug from psu ok.

yes it is normal. it will take speed under stress.