GTX 670 Not Detected by Motherboard

skullcube

Junior Member
Jun 21, 2014
15
0
0
Hi guys. I have an Asus P8Z68-V LE motherboard and a GTX 670. Up till two days ago everything was functioning perfectly - and has been functioning perfectly for 1.5 years (I was using Nvidia 335.23 driver). I then updated the driver to the more recently released 337.88 version-Clean Install. After this update I started getting BSOD with error code 50. I looked this error up and according to most people this error is caused by faulty hard drive, faulty RAM or faulty VRAM. I then decided to uninstall the Nvidia 337.88 display drivers.

As a result of this the BSOD stopped occurring but something very strange started happening. My computer would randomly detect the graphics card. Sometimes after a restart the graphic card will be detected. Other times it will not be detected and the computer will start using the onboard Intel graphics card. In my Bios I do have the primary display set to pcie as opposed to igpu. I then decided to format and reinstall windows, just in case this was some driver issue. Now the issue is that the motherboard is simply not recognizing the GTX 670 card and keeps reverting to onboard intel graphics (BSOD has not occurred since the uninstall of the Nvidia 337.88 display drivers).

The gtx 670 is properly connected to the power supply. I can see its fan running when the computer starts.

In BIOS even if I set the primary display to PCIE, the computer loads the Onboard Intel Card and the device manager does not detect gtx 670. In fact, reloading the BIOS (after a restart) shows that primary display has switched back to AUTO. This seems to imply to me that the motherboard simply does not detect the gtx 670 and when I force it to load graphics from PCIE, it reverts to AUTO so that something can be displayed via the onboard graphics card (I might be wrong about this-this is a hunch).

My motherboard also has 2 PCIE slots. One blue one, which is the primary slot -it is recommended to use this slot if using one card, and a secondary black slot. The card is not being detected in either of these slots.

Is it possible that a simple driver update has ruined my graphics card? The card was functioning fully well 2 days back. In fact I was playing Assassin's Creed Black Flag on Very High settings. I remove dust regularly from my computer. My GTX 670, prior to this, was idling at a temp of 45 celcius and under load would go as high as 65 celcius.

I would really appreciate it if someone can help me out.
 

Ketchup

Elite Member
Sep 1, 2002
14,559
248
106
AUTO is the default video setting on most boards I have seen, so no worries there.

Try this. Get a bottle of compressed air. Remove the video card and dust it out. Don't forget the pins. Dust out the pci express slot. Put the card back in. Don't forget the power connector. Let us know how it goes.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Hi ketchup79. Thank you for the prompt reply. I will do this and post an update in the coming days.
 

VirtualLarry

No Lifer
Aug 25, 2001
56,571
10,206
126
I'm confused. The BIOS is reverting the setting for the GPU from "PCI-E" to "AUTO", next time you enter the BIOS? Perhaps the CMOS battery is failing?
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Hi VirtualLarry. Yes. The next time I enter BIOS the setting has reverted from PCI-E to AUTO. To check whether it was cmos battery issue, I changed one other harmless setting too...but the bios seems to remember that.
 

Ketchup

Elite Member
Sep 1, 2002
14,559
248
106
Hi VirtualLarry. Yes. The next time I enter BIOS the setting has reverted from PCI-E to AUTO. To check whether it was cmos battery issue, I changed one other harmless setting too...but the bios seems to remember that.

This sounds like a "Smart" feature to me. It didn't properly detect a card in the spot selected, so it automatically reverts to AUTO.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Hi. So I unplugged my GPU and cleared out any dust in all the locations mentioned and securely put the power supply cord back. After turning my computer on something strange happened. My Intel HD Graphics was no longer detected. The device manager just shows VGA adapter and the GTX 670 is still not detected.
 

denis280

Diamond Member
Jan 16, 2011
3,434
9
81
After reading all above.the only solution left is to do is to clear cmos
 

Ketchup

Elite Member
Sep 1, 2002
14,559
248
106
Hi. So I unplugged my GPU and cleared out any dust in all the locations mentioned and securely put the power supply cord back. After turning my computer on something strange happened. My Intel HD Graphics was no longer detected. The device manager just shows VGA adapter and the GTX 670 is still not detected.

So you are getting video from somewhere if you are telling us about device manager. Which video is plugged in?

And what Denis said.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
So the way I have setup my computer, I have both the graphics card and motherboard plugged to the monitor. So I pretty much always get some output on the monitor (depending on what is active-the onboard graphics or pcie graphics).

Also, suddenly, out of the blue, after windows had been running on Intel HD for an hour (Intel HD activated after a restart-I think its drivers didn't load previously and this caused the device manager to just show vga adapter), I launched device manager and saw GTX 670. I was finally able to install the drivers and it is running at the moment. However, I am not sure whether the card will still be detected after a restart or a shutdown (this just seems so random- at least the card is not busted because I just ran black flags).

I want to try this "clear cmos" option. How should I go about doing this safely?
 

Ketchup

Elite Member
Sep 1, 2002
14,559
248
106
Your manual should tell you where the jumper is. Normally would just power off, move the jumper to clear for a few seconds and move back, then restart and put the bios settings back to where you want them.

The only suggestion I would give is to not have both displays plugged in for troubleshooting. You computer will use only one for primary anyway, so just pick one and test with that.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Hi. So as expected after a shutdown and start, the graphic card GTX 670 was again not detected (and system went back to Intel HD). I then did a CMOS reset, however, it has not helped either. At the moment the system is on Intel HD.

Now I am not sure that what could possibly be causing problems. The GTX 670 seems to be working perfectly once it gets detected.

I have a feeling that when the computer is left on for a long period of time, somehow the motherboard just detects the graphic card.

Another piece of information, which might be irrelevant, is that my time keeps switching from am to pm after each restart (is this related...for some reason the bios clock is on pm as opposed to am)?
 

Ketchup

Elite Member
Sep 1, 2002
14,559
248
106
What power supply do you have?

It sounded a little like the board before your last tidbit, but not even more so. So is the time correct except for the fact that the am/ pm change? Are any of the other BIOS settings changing? Because it could be a bad CMOS battery, but even if that were the case the video card should still be detected.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
I have a Corsair 600 Watts power supply. I checked my volts they were between the +-5% range.

The difference is only am/pm. Time and date are correct. The am/pm difference appears randomly too.

The GTX 670 is still not being detected.

I can try and change the CMOS battery (is this easily available?).

The thing is that none of the parts are in warranty now and so it sucks that this started happening out of the blue, after I downloaded those Nvidia drivers.

I really don't know what to do but to replace parts (which I cannot afford atm) and like you said this CMOS battery thing is probably not causing it.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
I also downloaded the Asus PC diagnostics tool. It shows that both the PCIE slots are functioning normally.

The computer just does not detect the GPU but at random times (and then the GPU works perfectly) and after a shutdown/restart GPU stops getting detected-till it randomly appears again.
 

Ketchup

Elite Member
Sep 1, 2002
14,559
248
106
I mean this COULD be the video card, and I could be completely wrong here, it just doesn't sound like it to me.

Interestingly enough, I had a very similar issue that started about a month ago. In may case, PhysX stopped working with the latest driver at the time, and I never saw the post screen. But Windows was fine, and older drivers ran PhysX fine.

I finally switched to a different pci-express slot and all is back to normally. It's only an 8x, but should be fine for what I need.

From looking at your board, it looks like you don't have another slot to try that. What would be cool at this point is if you had another board to try with the card, or card to try with your board, just to be sure.
 

hurrakan

Member
Mar 14, 2013
33
0
0
What version BIOS does your motherboard have? The most recent updates look like they might be relevant to your problem...

Version 4102
Improve system stability.
2014/05/22

Version 4101
Enhance compatibility with some PCIE device.
2013/08/08

Version 4002
Fixed onboard & add-on VGA card compatibility issue.
2013/05/03

Version 3903
Enhance compatibility with some USB devices.
Fixed Nvidia GTX 680 hang when runing with UEFI driver.
2012/10/18

http://www.asus.com/Motherboards/P8Z68V_LE/HelpDesk_Download/
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Yeah I have never updated my bios. I have heard its risky. Should I try it? I have heard that your motherboard can basically turn to brick...
 

Gunbuster

Diamond Member
Oct 9, 1999
6,852
23
81
Yeah I have never updated my bios. I have heard its risky. Should I try it? I have heard that your motherboard can basically turn to brick...

Not risky at all. Only thing to watch out for is loosing power during the flash process. So umm don't do it during a storm or get yourself a UPS.
 

hurrakan

Member
Mar 14, 2013
33
0
0
Yeah I have never updated my bios. I have heard its risky. Should I try it? I have heard that your motherboard can basically turn to brick...
Yeah, the general advice is to never update your BIOS unless it is necessary to fix something - but this is one of those times, it seems.

You can use CPU-Z to check what your current BIOS is (under "Mainboard" tab): http://www.cpuid.com/softwares/cpu-z.html

Personally, I always use Asus motherbaords and I've never had a problem updating BIOS. There are a few ways to do it but I just copy the new BIOS to a USB stick and then update from within BIOS.
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Are bios updates cumulative? Should I just do the most recent one? Or do I have to do all that were released since my current bios version?
 

skullcube

Junior Member
Jun 21, 2014
15
0
0
Okay. WIll try this. So my MOBO has a feature in the bios to update from UPS. Before that do I need to reset cmos again? Or can I just do that right now without any other prep?