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Upgrade from nvidia to amd, no signal

Last response: in Graphics & Displays
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February 24, 2013 3:16:48 AM

Hello,

I recently bought a Gigabyte hd 7950 to replace my gtx 470. Unlike my old gtx, which used two 6 pin pcie connectors, the 7950 Used one 6 pin and one 8 pin, i dont have an 8 pin so i used a molex to 8 pin that came with the card. No signal from monitor.

I thought the problem was my psu, so i connected the gtx 470 by molex, it worked fine. I booted up with the gtx ( no onboard vid ) uninstalled nvidia driver, drivesweeped it, then install ati driver. Still no signal.

At this point i thought the card was faulty, i rmaed at, got a replacement, tried every step again, still no signal. My 680w psu met the require and the 7950 require less power than my old gtx, so i dont see whats wrong.

Im seriously considering getting a refund, pay 15 pcts restocking fee and quit pc gaming so good as this is already too much headache. Would appreciate it if you guys could help.
March 4, 2013 10:17:12 AM

Aznsuperman said:
Hello,

I recently bought a Gigabyte hd 7950 to replace my gtx 470. Unlike my old gtx, which used two 6 pin pcie connectors, the 7950 Used one 6 pin and one 8 pin, i dont have an 8 pin so i used a molex to 8 pin that came with the card. No signal from monitor.

I thought the problem was my psu, so i connected the gtx 470 by molex, it worked fine. I booted up with the gtx ( no onboard vid ) uninstalled nvidia driver, drivesweeped it, then install ati driver. Still no signal.

At this point i thought the card was faulty, i rmaed at, got a replacement, tried every step again, still no signal. My 680w psu met the require and the 7950 require less power than my old gtx, so i dont see whats wrong.

Im seriously considering getting a refund, pay 15 pcts restocking fee and quit pc gaming so good as this is already too much headache. Would appreciate it if you guys could help.



Hey there,

Short answer - try installing driver for video card over VNC.

I had the same issue tonight, when installing my new Sapphire 7950 - upgrading from 6950, after just having installed new AsRock Mobo. Got no signal from DVI monitor, but everything lit up and fans spun fine - AMb have red leds if "fault" or now power, and fans on card were spinning at normal speed.

Yet I got no signal from DVI monitor that had worked perfectly fine before installing the Card.

ON a wild hunch, I decided to log in via VNC (one of the first things i set up with a new PC build). What i found was a little 800 by 600 interface. I loaded the AMD install disk, ran through install, rebooted when prompted, and viola - my beautiful new 7950 was outputting to monitor.

My guess is MOBO thinks its outs are not needed anymore, so turns them off, but video card is not ready without drivers.
!