You might need to use the Flashback for the board to support the Kaby. If not sure how to, post back. On the other hand, the 04 error with BI/2 slots might be related to a bent pin in the CPU socket. Try firstly the Flashback and then test each RAM slot with single module. Answer from alexoiu on forums.tomshardware.com
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Reddit
reddit.com › r/asrock › post code 4d? i've had a couple random issues since updating to 3.25...
r/ASRock on Reddit: POST Code 4D? I've Had a Couple Random Issues Since Updating to 3.25...
May 22, 2025 -

Built Nov. 30th, X870E Taichi Lite, 9800X3D, QVL Listed 2x32 6000/30 Corsair Vengeance RAM, XMP Enabled, SoC Voltage 1.185, SoC/Uncore OC Mode Enabled, No PBO or other OC settings enabled.

I've now had 2 anxiety-inducing issues snice updating from 3.12 to 3.25. I usually leave my PC on all the time while at home and only turn it off when I'm going to be out of the house for some time. A couple days ago, while the PC had been on for a couple days, I turned my TV on and had no signal. No idea if it was completely locked up, but it responded to the reset button, booted up fine, and then ran for another 2 days without issue.

Last night I shut it off before leaving for work. I get home this morning turned it on, got a signal and the ASRock logo on screen... and then it froze. POST Code was 4D, which is not listed in the manual. I did notice in the bottom right corner a suggestion to hit F2/Del for UEFI or F11 for boot menu, which I'd never seen before. Got nothing out of F11, didn't try going into UEFI.

Full power down and switching off the PSU for a while got things running again, but I've read people were doing this on occasion just prior to their CPU's dying. Though, I at least had a signal on screen and the message in the corner leads me to believe it was just having some trouble with my boot devices?

Anyway, curious if others have seen this sort of behavior on 3.25... and if someone could tell me what 4D means I'd be much appreciative. It'd at least give me a place to start.

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ASRock
asrock.com › support › index.asp
ASRock > Debug LED Troubleshooting Checklist
We use cookies to offer you a more personalized and smoother experience. By visiting this website, you agree to our use of cookies. If you prefer not to accept cookies or require more information, please visit our Privacy Policy · Necessary cookies These cookies are essential for the proper ...
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Asrock
asrock.com › support › faq.asp
ASRock > FAQ
Dr. Debug is used to provide codes that represent different errors that your system has encountered. Please see the diagram below for reading the Dr.
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Reddit
reddit.com › r/asrock › d6/d4-0d codes for months on and off randomly - solved ( i think :) )
r/ASRock on Reddit: D6/D4-0d codes for months on and off randomly - solved ( I think :) )
January 23, 2025 - You'll find occasional product reviews of ASRock hardware and of products from our partners. ... Just putting this here, in case someone checks this and helps someone. ... So put everything together with a EKWB AIO 360 and all is good for a while. Then started to tweak things, memory timings, PCO curves and things got a bit messy. And while I never touched memory voltage, which can mess your memory physically, and then got to have either D4, D6 or 0d error codes on post.
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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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Overclock.net
overclock.net › home › forums › amd › amd motherboards
System won't boot - d4 error code | Overclock.net
I had run it on the motherboard box with a single gpu last night for several hours trying to learn the BIOS and doing lots of benchmarking and such. No problems. Now I have put in the rest of the water cooled gpus and fired it up for the first time in its final configuration. Progresses through the usual Q-codes, shows 27 and then stops on d4. d4 is not in the Dr. Debug manual for error codes.
Find elsewhere
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Tom's Hardware Forum
forums.tomshardware.com › home › motherboards
Any solutions to a 04/D4 error code? | Tom's Hardware Forum
July 20, 2016 - I should also note what each code means. 04 code is PCH initialization before microcode loading. D4 code is PCH allocation error. I suficient resources. So I feel like if it was a D4 error removing/changing my GPU slot should fix that error but it didn't change anything and still fails to boot.
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ASRock Forums
forum.asrock.com › forum_posts.asp
PLEASE HELP B550 steel Legend 4d Error Code - ASRock Forums
January 16, 2021 - Hello AsRock, I have recently purchased your B550 Steel legend. I have assembled my pc but have a serious...
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Linus Tech Tips
linustechtips.com › computer hardware › cpus, motherboards, and memory
D4 Error Code - CPUs, Motherboards, and Memory - Linus Tech Tips
April 11, 2018 - Hey guy i recently upgraded to windows 8 and when i boot up mu pc i get a D4 error code on the debug leds My system specs are ga-z77-ud3h i5 3570k 4gb ram 1600 v200 ssd and an hd 7870xt i have no overclocks and i didn't have this problem with windows 7 I have no sability issues but still waht dos...
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ASRock Forums
forum.asrock.com › forum_posts.asp
BIOS nightmare with Z790 Pro RS/D4 - ASRock Forums
April 22, 2025 - So I built a new Unraid server in February and have run into the worst hardware issue I?ve ever experienced...
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ASRock Forums
forum.asrock.com › forum_posts.asp
x399 and error B4 - ASRock Forums - Page 1
Hi!When you boot the bios, the computer shuts down on dr.doctor last value b4. Only the keypad is connected.Taichi...
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Reddit
reddit.com › r/asrock › dead? 9950x3d + x870e nova error "4d"
r/ASRock on Reddit: Dead? 9950x3d + x870e nova error "4d"
April 4, 2025 -

Forgot to update, I've been using the CPU and RAM on a gigabyte motherboard for almost 6 weeks with no issues so far. x870e nova RMA still in process.
------------------------------------------------------

9950x3d + x870e nova + XPG Lancer Blade 2x16 6000MTs. I've been using 3.20 bios since I built the pc on march 13th

I can get into bios but as soon as I try to boot to my nvme or windows media usb it gets stuck on the logo with code 4d.

What I've tried:

- Clear CMOS

- Downgrade bios to 3.16

- Unplug everything except CPU and 1 ram

- Removed CPU to check mobo pins and everything looks good

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Reddit
reddit.com › r/buildapc › asrock z77 extreme4 suddenly failing to boot with a d0 error
r/buildapc on Reddit: ASRock Z77 Extreme4 Suddenly failing to boot with a d0 error
June 1, 2018 -

Hi all, I've had my computer for several years now. About a month ago I started having issues. Upon rebooting, the computer wouldn't post and I would get 6 beeps on the motherboard. Dr. debug gives me a 4F code followed by d0. D0 is listed as CPU initialisation error in the manual. After giving it some rest and coming back, the computer turned on. I've had no issues when the computer is on, but every time I restart, I'd have the issue again. Today I had to restart and I can't get it to come back at all. Same errors as before.

I've taken it all apart and disconnected everything except the CPU and one stick of ram and I still get the same code. I'm wondering if either the CPU or the motherboard is done for.

I can't remember all the specs, but I'll list them the best I can: ASRock Z77 Extreme4 Intel Core i5 (can't remember model) Corsair HX620W modular power supply 4x G.Skill RipjawsX DDR3-1600 4GB Gigabyte Radeon HD 7950

I'm not sure where to go from here. I haven't changed anything that would affect this. If anyone has any ideas on how to get it up and running again, I'd really appreciate the help

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Reddit
reddit.com › r/buildapc › new build- can't get into bios, no video, mobo code of 04/d4
r/buildapc on Reddit: New build- can't get into BIOS, no video, mobo code of 04/D4
May 29, 2016 -

Troubleshooting Help:

What is your parts list? Consider formatting your parts list.

PCPartPicker part list / Price breakdown by merchant

TypeItemPrice
CPUIntel Core i7-6700K 4.0GHz Quad-Core Processor$338.99 @ SuperBiiz
CPU CoolerCorsair H80i v2 70.7 CFM Liquid CPU Cooler$84.99 @ NCIX US
MotherboardGigabyte Gigabyte GA-Z170X-GAMING 6 ATX LGA1151 Motherboard$152.98 @ Newegg
MemoryCorsair Vengeance LPX 16GB (2 x 8GB) DDR4-2400 Memory$57.99 @ Newegg
StorageSamsung 840 EVO 250GB 2.5" Solid State Drive-
StorageWestern Digital SiliconEdge Blue 256GB 2.5" Solid State Drive-
StorageA-Data Premier SP550 480GB 2.5" Solid State Drive$107.99 @ NCIX US
Video CardPNY GeForce GTX 660 2GB Video Card-
CaseCorsair 330R Titanium Edition ATX Mid Tower Case$79.99 @ Newegg
Power SupplyCorsair RMx 750W 80+ Gold Certified Fully-Modular ATX Power Supply$94.99 @ Newegg
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates)$957.92
Mail-in rebates-$40.00
Total$917.92
Generated by PCPartPicker 2016-05-28 21:47 EDT-0400

Describe your problem. List any error messages and symptoms. Be descriptive.

Building a new PC. Can't get BIOS to display. LED on the motherboard shows D4 or 04.

List anything you've done in attempt to diagnose or fix the problem.

Breadboarding my system. With only mobo/CPU/cooler I will get 5 long beeps from the speaker. When I insert my RAM, there are no beeps and the mobo hangs on the error code 04/D4.

Provide any additional details you wish below.

24 pin and 4+4 pin have been quintuple checked. Have tried every combination of 1 and 2 sticks of memory in all 4 slots. I bought another set of 2x4GB sticks to do the same with no luck, but they are the same line of memory so I may have goofed that test.

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Reddit
reddit.com › r/buildapc › [troubleshooting] asrock extreme 4 z77 dr. debug d6 error
r/buildapc on Reddit: [Troubleshooting] ASRock Extreme 4 Z77 Dr. Debug d6 error
May 16, 2014 -

Was recently using my computer and decided to put it to sleep for the night. The next morning I wake up and try to turn it on nothing on the monitor pops up and I see the red glow from inside the case saying something is up. I check it and get the d6 error. I then go through my normal troubleshooting routine.

  • Restart

  • Turn off and wait

  • Clear CMOS

  • Remove CMOS battery

  • Test multiple monitors and TV's with other computers

  • Remove power and sit, for multiple months

With college coming up I want to solve this issue. I do not have a graphics card, so that removes those potential issues. I was running the Intel HD4K on an 3570k OC'd to 3.9ghz.

For reference, the d6 error is something along the lines of no video output attached.

I have had no real issues since the completion of the build in July of 2012.

My two options seem to be buy a GPU (I'll need it for solidworks, and was going to get one eventually anyway) and run it (assuming I can actually install the drivers without a screen) or buy a new MoBo or try and RMA the currently defective one.

Does anyone have a solution to the error either way? Or am I going to have to bite the bullet and shell out some money for new parts.

Thanks.

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Overclock.net
overclock.net › home › forums › intel › intel motherboards
Asrock Z77 Extreme 4 BIOS problem - Dead mobo - D0 LED Status | Overclock.net
May 12, 2012 - I was able to reflash to 1.2 because I could sporadically trigger a proper boot by resetting the bios, removing/adding RAM or removing expansion cards. Both 1.2 and 1.4 versions were downloaded from ASRock's web site, written to the same usb flash drive, and flashed from the MB's BIOS setup. It appears to be working fine now, not a single d0 error after warm boot or after complete power down.
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Overclockers UK
forums.overclockers.co.uk › hardware › motherboards
ASROCK X570 TaiChi - post code 4d. No post. Awesome OC support | Overclockers UK Forums
June 1, 2020 - AsRock support responded to a ticket I raised on the same day I contacted OCuk. ASRock got back to me yesterday with: "Please use the ClearCMOS jumper to reset the CMOS - Switch off Power first - Press power button to discharge - put a jumper cap on the clrCMOS jumper.