PC no longer detecting graphics cards

ShinyRedKnight

This morning I turned on my PC, and all the lights in the system, including the GPU, turned on and the fans are working as normal. The only difference is that the monitor was not doing anything, as if it wasn't receiving any signal.

At first I tried a different monitor, but the same issue occurred. I then tried a different GPU, and again it didn't work. I connected to the MOBO dvi connection and that gave me picture. I then saw that all of the nvidia programs/drivers were missing. The PC was totally fine last night, less than 7 hours ago.

I tried to install the latest driver, but the driver wouldn't go through as it said it could not detect the proper hardware, even though an nvidida gpu was plugged. I thoughy it was a power issue for the GPUs, but there is more than enough for them, and they do light up like normal with all fans working. I could really use some help with this. Here are my specs:

GPUs tested: Geforce Titan X and 970
PSU: EVGA 850 G2
Motherboard: Gigabyte Z77x UP4 TH
CPU: i5 3570K
Ram: Corsair Dominator
Windows 8 64 bit

wunderbar

hrm, this is an interesting one. Most systems I've encountered, if you have a GPU plugged in the onboard graphics won't work at all, even if you plug something into it. That the onboard works with a GPU plugged in is....troubling.

The only things I can think of are that maybe a bios setting changed to force it to the onboard graphics, or that there's a problem with the PCI-e slot. Do you have an SLI board with multiple pci-e slots?

I'd do the following:

take the GPU out, power the system on using onboard graphics
turn system off, plug in GPU, use GPU graphics when booting.
if that doesn't work, try a different PCI-e slot if you have one.


if that doesn't work, again take gpu out and go into bios using onboard graphics and see if there's a setting or something for the graphics.

Failing that, you may have a motherboard issue.

Handgimp

Yeah sounds like an issue with your pci-e bus at first blush. Maybe try a not-16 channel?

ShinyRedKnight

Thank you guys for the comments.

My first route based on the recommendations was to go into the bios. The load order for the monitor was set to auto (pci or integrated). That is the default and I have never had issues with it until now. I set it manually to PCI, and now it works as normal and my gpus are detected.

So my question is why this happened... Should I be planning on replacing my mobo?

One thing that really scares me is that I have heard that display port cables may carry power when they are not supposed to; I use the one that came with ROG swift. Could power have gone through the cable and messed with the mobo? Then again, the same exact PCI is still working, its just the bios that went wonky.

ShinyRedKnight

So another update; it seems the BIOs is working normally now when set to auto for the display, and goes to my GPU as it should.

Hopefully it means I don't have to replace the mobo yet.

tsmvengy

Yeah, it was probably some weird thing where the motherboard forgot what configuration it was in. I bet wunderbar's solution would have fixed it too.

nexuscrawler

Might be worth looking if your board has a BIOS update available