No signal from graphics card. Please help.

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Fritolays

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Aug 24, 2014
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My graphics card (gigabyte geforce gtx 760 windforce OC 4gb) appears to not be sending a signal to my monitor. This card worked without issue for almost a year, until one day after a thunderstorm (computer is on a surge strip) it stopped working.

Here is a list of some of the things I have done to try and fix this:

  • I have sent it into gigabyte for repairs, they said it had a bad component and is repaired with no further details.

    I have tested my HDMI cable on other machines and tried using a DVI cable, the HDMI worked on other machine DVI from GPU also gave no signal.

    I have tried a separate graphics card in PCI slot and it had no signal, So i figured it was my mobo and got a new one. But now the GPU has no signal with the new mobo (both have been asrock z77 extreme 4s).

    I tested the power cord to the graphics card with a multimeter, I tested the resistance of each wire in the pins and got the same .6 ohms for each. I don't have much experience working with multimeters and therefore didn't really know how else to test it or the power supply.

    When I go to device manager it can identify the graphics card and thinks it is functioning. I have my bios setup to try to boot to PCIE before onboard graphics. It appears to be trying to do this; when my computer starts up i get no signal from either the graphics card or the on board graphics for the first few seconds until the on board switches on (about halfway though start up.)

I can't test graphics card in anyone else's computer because it is too large and i don't know anyone near with me with a large enough computer case to fit it.
I've run out of ideas, any help would be greatly appreciated.

Computer specs:
Motherboard: Asrock z77 extreme 4s
CPU: i7-3770
Graphics card: Gigabyte geforce gtx 760 windforce OC 4gb
RAM: 4 x Corsair vengence 4 gb.
Power supply: Corsair CX600M
OS: 64 bit windows 7 Home premium sp1
 
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Fritolays

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Aug 24, 2014
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Yes, they work, when my graphics card fails to put out a signal my computer appears to be switching over to onboard graphics on startup.
 
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ronintexas

ronintexas

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I clicked too quickly....

I would double check the power connections to the GPU ensuring they are seated properly (there may be an issue with the PSU delivering power to the GPU also).

Last, I would boot up with 2 monitors connected - one to the mobo, the second to the GPU, and uninstall the drivers for the GPU, then do a fresh install. If that fails - I would point to the PSU.
 
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Fritolays

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Aug 24, 2014
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The power pins all appear to be secured at both the GPU and the PSU end (its modular.)

I don't have a 2nd monitor to test with but i have been running both the gpu and the onboard to the same monitor and changing which input is being displayed to check if it is working.
 
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ronintexas

ronintexas

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Different mobo/gpu combinations behave differently when you are switching between the Intel graphics and the GPU. Theoretically, you can boot using the onboard graphics, remove all the drivers for the GPU, download and install the new drivers, reboot with the cable in the GPU, and see if it works....

Troubleshooting with dual monitors is easier - as the connections are identified to the system when you power on. Sometimes switching a cable between the mobo and/or GPU doesn't switch over the graphics - so you might have to boot into the "mode" (GPU OR Intel) you want to utilize.
 
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Fritolays

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Ok, yeah I've got vga to the onboard and hdmi to gpu and my monitor switches pretty easy between those two settings so it helps keep tract of which is which. I have tried removing and reinstalling the drivers for the gpu while using the onboard graphics, think I forgot that in my list of things i tried.
 
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ronintexas

ronintexas

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Dec 10, 2012
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When you power on the computer, part of the post is checking for monitors plugged into ports - and if no monitors are detected in the GPU (since your only monitor is plugged in the onboard graphics), it may not "enable" the card. Having two monitors - one plugged into the GPU and one to the onboard graphics would ensure that both are enabled.

Once booted, when you switch ports on the card, it should automatically detect a monitor on the new port and turn it on....I am wondering if your combination of GPU and mobo are not enabling the card, and so when the switch it done, it doesn't enable that port....
 
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Fritolays

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Aug 24, 2014
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I've tried starting up with only the graphics card connected to the monitor and not the on board. Yet it is still switching over to the onboard.

I couldn't find any incompatablity issues with the GPU and mobo and it worked fine for almost a year.
 
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Fritolays

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Aug 24, 2014
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Update: I tested a DVI to HDMI adapter to connect my HDMI cable to the gpu and I am getting signal from the gpu during the bios and initial launch but when windows starts up the gpu cuts out and it goes to onboard graphics. I also can get signal from the gpu if i run windows in safe mode.

I'm not sure what this means but it feels like a break though.
 
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