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Reddit
reddit.com › r/gigabyte › aorus z690 pro | suddenly fails to boot, stuck at debug code c2
r/gigabyte on Reddit: AORUS Z690 Pro | Suddenly Fails to boot, stuck at Debug Code C2
June 5, 2023 -

Hey everyone, i tried to turn on my pc this morning, but it won't boot. As the title says, it gets stuck at Code C2. It was running as always as i shut it down yesterday in the evening.

After trying multiple things, like removing the GPU, using only one RAM stick, using different RAM Slots and so on, I'm kind of lost.

i filmed the code sequence in slow mo, as i couldn't find any codes starting with 0 i'm assuming they are Dx codes:

  • 7F - Reserved for AMI use

  • 19 - Pre-memory South-Bridge initialization started

  • D0 - CPU initialization error

  • D2 - PCH initilization error

  • D0

After this Sequence it repeats itself + some extra codes

  • previous sequence

  • D3 - Some of the architectural protocolls are not available

  • 4F - Reserved

  • 8F - Reserved for OEM use

  • 1F - Reserved

  • 52 - Reserved

  • D0

  • D2

  • finally getting stuck at C2 - Reserved

I kind of accepted that something broke and i have to replace a part, but i have no idea which part. So any help would be appreciated.

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Tom's Hardware Forum
forums.tomshardware.com › home › motherboards
Gigabyte Error Codes | Tom's Hardware Forum
February 2, 2017 - Gigabyte z270 gaming 7 error codes when I turn it on there is no hdmi output and I get a bunch of c0 c1 c2 error codes before it shuts off and this repeats.
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Badcaps
badcaps.net › home › forum › troubleshooting hardware & devices and electronics theory › troubleshooting desktop motherboards, graphics cards, and pc peripherals
GIGABYTE GA-H110M-S2 - Stuck at Debug Code C2 - don't like Patriot Viper Steel RAM but works with G.SKILL - Badcaps
March 21, 2025 - C2 - OEM BDS initialization codes -> TL631 test board lits DRAM LED here When I insert some other RAM sticks, eg. some different GSKILL or kingston the board POST's without any problem.
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Reddit
reddit.com › r/gigabyte › z690 aorus pro ddr5: only one dimm slot works, 28 54 c2 c3 c4 error codes on repeat for faulty slots
r/gigabyte on Reddit: Z690 Aorus Pro DDR5: Only one DIMM slot works, 28 54 C2 C3 C4 error codes on repeat for faulty slots
December 20, 2021 -

Long story short, recently brought a new CPU (i7-12700K) and motherboard (Z690 Aorus Pro DDR5). Only one DIMM slot works, which is the one furthest from the CPU. This is not the recommended one to use according to the manual, but it's the only one that works. I have two individual sticks of RAM (2 x 16 GB Kingston Fury DDR5-5200), both work, but only in one slot. The other three slots do not work (tried and tested for both sticks).

Things I've done to try and resolve:

  • Q-Flash to the latest bios from Gigabyte's site

  • Enable XMP (after successful boot in one slot and then adding sticks to the other slots) to both profiles

  • Checked and reseated CPU

  • Made sure CPU cooler was not fixed too tight to the MOBO

  • Reset CMOS

  • Manually gone back to BIOS settings

In summary, the computer boots fine when a single stick of RAM is in a specific single slot. Otherwise, it repeatedly tries to boot with 28, 54 C2, C3, C4 error codes. It's either the motherboard (likely) or CPU (due to memory controller).

Any help at all is appreciated.

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Level1Techs
forum.level1techs.com › hardware hub › motherboards
List of Dr Debug BIOS Codes - Motherboards - Level1Techs Forums
March 28, 2017 - Recently I was busy troubleshooting an issue with my ASRock mainboard and Ryzen and I needed to lookup some of the Mainboard debug display error codes. As It turns out there aren’t really any official manuals I could find for this. So here are my debug codes that I could find and what they mean.
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Tom's Hardware Forum
forums.tomshardware.com › home › motherboards
Question - HELP! Gigabyte Mobo Code "02" then occasionally "CC" | Tom's Hardware Forum
January 6, 2020 - Are you SURE that's 02, and not D2? Because they would look the same. D2 is a PCH initialization error. Seems like the C range of error codes are memory related. Full blast fans usually indicate either no memory installed, no CPU installed or bent pins on the CPU.
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TweakTown Forums
tweaktownforum.com › forum › tech-support-from-vendors › gigabyte › 30866-ga-ex58-ud5-doesn-t-boot-led-error-c1-b2
GA-EX58-UD5 Doesn't boot, LED error C1 & b2 - TweakTown Forums
February 22, 2009 - I just wish someone could say exactly wtf a B2 code means when the board hangs on it! ... Re: GA-EX58-UD5 Doesn't boot, LED error C1 &amp; b2 I have exactly the same problem. I tried replacing the motherboard and CPU but I still got the same issue. I have however read this on the Gigabyte website regarding the motherboard: "Why EX58-EXTREME, EX58-UD5, EX58-DS4 can't boot with some Core i7-920, Core i7-940 CPU?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> <o:p> </o:p> GIGABYTE X58 series motherboards may have compatibility issues with Intel Core i7 940 and 920 production version CPU, so we strongly recommend you to update the latest BIOS as following for better performance, EX58-EXTREME BIOS version F3 EX58-UD5 BIOS version F3 EX58-DS4 BIOS version F3 You can use BIOS build-in Q-Flash utility, or Window based @BIOS utility to update BIOS.
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WePC
wepc.com › home › tips & tricks
Motherboard error codes explained - For Gigabyte, ASUS, and MSI motherboards
February 5, 2024 - If your motherboard does not have a Q-Code display, look to the right middle of the motherboard and there may be a cluster of four lights labeled CPU, DRAM, BOOT, and VGA. These are also methods of showing errors. If your PC doesn’t boot, consult these four lights whilst the PC is trying to boot. There’s no website dedicated to finding Gigabyte fault codes, but we have put together a list of the most common Q-Codes on Gigabyte motherboards.
Find elsewhere
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Hardware Centric
hardwarecentric.com › home › gigabyte motherboard error codes: crack the gigabyte motherboard error code like a pro
Gigabyte Motherboard Error Codes: Crack the Gigabyte Motherboard Error Code Like a Pro - Hardware Centric
August 12, 2024 - For example, code 00 indicates normal functioning, while code 02 signals that the CMOS configuration data is corrupt. So if your Gigabyte motherboard is stuck displaying an error code, checking the code against Gigabyte’s list provides valuable ...
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Asus
rog-forum.asus.com › t5 › z170 › mb-won-t-post-q-code-2c › td-p › 707159
MB won't post - q code 2C - Republic of Gamers Forum - 707159
March 6, 2024 - As you suggested, I have tried every combination in every memory slot bu the result is still the same each time. As I said before, even with just a CPU and memory module plugged in, with nothing else interacting with the board, it still stops immediately at q code 2C and goes no further.
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Gigabyte
download.gigabyte.com › FileList › Manual › mb_manual_b550-aorus-master_1001_210329_e.pdf pdf
Gigabyte
CODEC · B550 AORUS MASTER · F_PANEL · F_USB1 · EC_TEMP2 · SYS_FAN6_PUMP · F_USB2 · SYS_FAN3 · USB 2.0 Hub · D_LED2 · LED_C1 · LED_C2 · D_LED1 · F_AUDIO · F_U32 · SYS_FAN1 · LED_CPU · M2_WIFI · CPU_OPT · iTE® · Super I/O · M2A_CPU · 42 · 80 · 110 ·
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EVGA
evga.com › support › faq › FAQdetails.aspx
EVGA FAQ - My motherboard displays a C1, C3, 68, 69, or C5 error upon boot.
April 16, 2017 - C1, C3, 68, 69, or C5 errors are usually related to memory or memory controller errors · Try manually clearing the CMOS on the boards. Refer to the board's documentation if you do not know how. This can be done by moving a jumper on the board, or if the board has an onboard CMOS clear button, ...
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Overclockers
overclockers.com › home › forums › hardware › motherboards › intel motherboards
Gigabyte Z170X Gaming 7 not posting after error | Overclockers Forums
December 5, 2015 - Sent the MB back to Gigabyte and after two weeks got back what they call a "replacement/swap". Interestingly, the "replacement" MB came back in the same box with the same cables, etc. It does appear to have a new serial number sticker but the numbers are nearly identical to the board I sent back other a couple of leading digits. What makes me highly suspicious is the fact that the "replacement" board does exactly the same thing! Throws out the C2, C3, C4, C5 codes, reboots, repeats and ends with a 4C.
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Linus Tech Tips
linustechtips.com › computer hardware › cpus, motherboards, and memory
System fails to POST after CPU, MOBO, and DRAM upgrade - CPUs, Motherboards, and Memory - Linus Tech Tips
December 7, 2021 - CPU: Intel Core i9-12900K MOBO: Gigabyte Aorus Ultra Z690 (DDR5) DRAM: 2x16 G.Skill Trident Z5 (DDR5, 6000, 36-36-36-76) GPU: Nvidia RTX 3090 PSU: Corsair RM1000i Upgraded from i7-7700K so needed new mobo and was lucky enough to snag some DDR5. Got system all back together and I'm receiving sever...
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 2465148 › computer-wont-boot-stay-stuck-at-c2-what-does-this
computer wont boot, stay stuck at C2. What does this indicate? - Microsoft Q&A
August 5, 2011 - To answer you, no there are no message codes what-so-ever. Yesterday, we re-seated everything, and after reseating the computer managed to boot up once again with no real problems, but continued to overheat at 94 degrees.
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GIGABYTE
gigabyte.com › home › consumer › motherboard › b650m c v2
B650M C V2 (Rev. 1.0) Motherboard Support - GIGABYTE Global
Update CPU ID/Micro codes in new BIOS means? [1] To support new series of CPUs, or [2] To support the same CPU but with new stepping.
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Tom's Hardware Forum
forums.tomshardware.com › home › motherboards
Question - Z370 Gaming 5: C4 and C5 LED code error | Tom's Hardware Forum
June 16, 2019 - I went to manual of my mobo and It is telling that is a problem with DRAM, because If the CPU/VGA/DRAM LED is on (another piece of LED, It is not that shows C4 and C5), so this means the corresponding device is not working normally. You can check here in page 26: http://download.gigabyte.us/FileList/Manual/mb_manual_z370-aorus-gaming-5_1002_e_190520.pdf So, all of my 2 ram's didn't work and my mobo is telling that the problem is in DRAM.