Intermittent boot failure GIGABYTE GA-Z77X-UD3H error code 96

I have a computer I built in 2012 with a GIGABYTE GA-Z77X-UD3H which rarely fails to boot and must be reset. The error code when it fails to boot is 96, which translates to "Assign PCI device resources".

The video card is an NVidia GTX 750 Ti. I mention that because recently when it wouldn't boot at all, I found a resolution which was to disconnect the video card, flash the bios using onboard video, and then reconnect it. It seems like there is something that still needs to be resolved causing these intermittent issues.

Most of the resolutions I've found while researching it resulted in an RMA. That doesn't seem likely at this point. It's been quite a while since I built and maintained computers so I need some guidance in the next best steps to take to detect any configuration issues that may need to be addressed. I'm concerned I may have overlooked something when I built it.
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Craig KehlerDirector of Customer Service & Community RelationsAsked:
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RaminTechnical AdvisorCommented:
First of all check GIGABYTE website for (Chipset, BIOS, ...) drivers and NVidia for the latest drivers and update all.

Also Go to C:\Windows\Minidump\  and attach all *.dmp files so we can analyze them.
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
I should have clarified. Latest drivers and bios updates. This is failing to get past the bios so there are no dump files.
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RaminTechnical AdvisorCommented:
Can you boot your computer normally ?
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
Yes, intermittently it doesn't get past POST and gives that error code. I included the fact that I once had an issue where I had to reflash the bios without the video card as it may pertain to the intermittent problem. I'm looking for best next steps to diagnosing what could be causing the intermittent issue.
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RaminTechnical AdvisorCommented:
My first guess is Motherboard Hardware issue and then Power Supply.  check the motherboard carefully, check capacitors if they are unusual.

Try default values in BIOS for PCI slots,  make sure they are in Auto mode,  make sure the board is clean (no dust),  if there is another PCIe slot try another PCIe for Graphic Card.
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RobOwner (Aidellio)Commented:
Can you rule out the video card? Have you tried running the computer for a few days with just onboard video?
Could be bad RAM on the video card
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
Can you rule out the video card? Have you tried running the computer for a few days with just onboard video?
Could be bad RAM on the video card

Possibly but if were bad RAM on the video card I would expect to have problems at run-time as well. The video card has been pushed to it's limits in some games and it hasn't exhibited any memory issues. I will try running a test on the card.
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RobOwner (Aidellio)Commented:
Sure and RAM was only a guess... Could be some other part of the circuitry that has overheated etc.  

The main point here was to see if you get the issues without the video card in the box.  If that's successful, then I'd try running for a few days with another known working video card if you can get your hands on one.
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
I've run GPU and memory tests on the card and found no issues pushing to it's boundaries. I used FurMark and memtestg80.

My first guess is Motherboard Hardware issue and then Power Supply.  check the motherboard carefully, check capacitors if they are unusual.

Try default values in BIOS for PCI slots,  make sure they are in Auto mode,  make sure the board is clean (no dust),  if there is another PCIe slot try another PCIe for Graphic Card.

I've checked it and see no visible signs of failure, I have seen what happens to aging boards in previous lab maintenance. I reviewed the bios settings and didn't find anything amiss. PCI slots are set to Auto. I disabled the integrated graphics to see if possibly it was causing a conflict.

This is the power supply, actually overkill for what I used it for but that isn't where I would cut my budget! Power PC and Cooling has always been a good brand in my experience.

I will try the other PCIe slot next. It is tough to diagnose each one of the changes when it can take up to a week to fail once.

Thanks for the assistance so far.
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nobusCommented:
how often does the problem happen?
you must try eliminating devices, so disconnaect all disk and cd drives when not needed, printer, and external devices
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
It can take up to a week to happen once or as frequent as 3x in a day. I may have to go through some restart iterations to try these out. I don't have a lot of peripherals on the system, so eliminating devices shouldn't be too difficult. I'm curious what the perceived issue is, one of the devices is failing to power on or respond correctly and therefore interrupting the assignment of PCI devices? If that is the case can I just target PCI devices?
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RaminTechnical AdvisorCommented:
moving your Graphic Card to another PCI slot can give us new info.
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nobusCommented:
any device can even be locking up the bus, or parts of it
you can also replace parts - just keep a list of disconnected/ tested / replace parts  if it takes so long
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
Alright I will try to spend some time on this over the weekend and get back to you. It is still having issues with the onboard graphics disabled.

I will try the other PCI slot, then start whittling down other devices. Sorry for the delays, been busy and this computer is at home. It get's the least attention.
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RobOwner (Aidellio)Commented:
Going back to the video card... Any chance of running solely off onboard video and remove the video card and see if you still get the errors?
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nobusCommented:
can you post a picture of that bios error?
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
The bios error is on the motherboard, it would be a picture of the LED display on the motherboard showing 96 :)

Going back to the video card... Any chance of running solely off onboard video and remove the video card and see if you still get the errors?
I'm going to try the other slot first, going without the video card would limit the predominant use of this computer.... video games for my son heh.
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nobusCommented:
test with the onboard video alone - to check if that works
you can add the card later
also - what power supply do you have?  this card uses 300W
you can also test with another PSU - or test the card on another system
if all else fails - turn it in a shop for testing
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
Just wanted to drop in an update that your suggestions have been great so far and it's on me to do the work. I'm not abandoning this question :)
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nobusCommented:
post results of each suggestion !
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
Right now I'm trying the other PCI slot as Ramin suggested first. Haven't seen an issue for 3 days.
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
Well it wasn't the PCI slot, the problem just recurred. I will run with on-board video for a while and see if it's the video card.

Frankly I'm tempted to just upgrade the motherboard, CPU and GPU, but I really want to know what the root cause is.
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nobusCommented:
i would reinstall the OS for testing that out
you can install it on another disk, if you want to keep the old one intact
you can also boot from a live Linux cd - and see if that runs fine; that would assume your hardware is ok; or it can give you another error, pointing you to the "bad" device

btw - you did not  answer my question  -  what power supply do you have?  this card uses 300W
did you also test with another PSU - or test the card on another system, as i asked ?
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
i would reinstall the OS for testing that out
Since it is failing to post before the OS even gets involved, I'm curious how this could be a factor.

btw - you did not  answer my question  -  what power supply do you have?  this card uses 300W
did you also test with another PSU - or test the card on another system, as i asked ?

See this comment. https://www.experts-exchange.com/questions/29081042/Intermittent-boot-failure-GIGABYTE-GA-Z77X-UD3H-error-code-96.html?anchor=a42450796#a42450796

It's a 750W PSU. Sorry I thought I followed up and pointed that out, but apparently I got distracted.

Pretty convinced it is either the video card or the PCI bus that is faulty. It will be hard to determine which is the cause without using a lot of extra hardware and if I buy a new motherboard, I'm going to get a new video card, cpu, ram... to take full advantage of the improvements in tech since I last built.

However to satisfy curiosity I'm going to run for a while without the video card. My son can use his Xbox for games :)
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nobusCommented:
well -then check your bios batter- it should read min 3 V for a CR2032
that often creates weird problems
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RobOwner (Aidellio)Commented:
Pretty convinced it is either the video card or the PCI bus that is faulty
Possible to try the Video card in another machine and see if it exhibits any issues?
Given it looks like you'll be purchasing a new video card regardless, it'd be worth trying a new video card (or just another known working card).  If it has issues then I would be certainly leaning toward the motherboard (PCI Bus) being the issue.
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Craig KehlerDirector of Customer Service & Community RelationsAuthor Commented:
It is either the video card itself, the PCI bus on the motherboard or both. I will post more results if I get them or start a new question,  but you all have been very helpful.

Thank you!
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