x370 Taichi + 3700X , no post. Hints£
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=18435
Printed Date: 19 Apr 2026 at 1:06pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: x370 Taichi + 3700X , no post. Hints£
Posted By: Undchi
Subject: x370 Taichi + 3700X , no post. Hints£
Date Posted: 22 Mar 2021 at 9:14pm
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Existing system - X370 Tachi + Ryzen 1700. Bios version 5.4 Updated BIOS to latest available (6.4), booted with 1700, no problem. Inserted 3700X , no post. Reset CMOS (drained battery ,cleared using jumper), no post. Removed all memory but one stick , no post. Dr Debug ends the last code I see is 66 (CPU checking), nothing beyond it. Tried for multiple hours. Inserting 1700 back into the same MB, posts just fine. This means RAM, PSU, etc are all ok if I can consistently boot with it Any hints£ I am considering returning the CPU because I can not get it to work.. Thank you! |
Replies:
Posted By: cx5
Date Posted: 23 Mar 2021 at 3:42pm
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Hello @Undchi, Do you see bootloop 33, 7A, 3B, B6 ££ or stuck at 66£ without bootloop£ In actual is B6 not 66. If you see bootloop, then you have same problem as some of us faced before. My solution is = the motherboard cannot cmos reset when PCIE slots are occupied and GPU's extra two 8-pins power socket are plugged in. Hence try remove ALL hardware and all CABLEs then reset CMOS, else it might not reset fully and you keep seeing the problem. or try remove everything, include all cables, just the motherboard alone and RESET cmos. then boot motherboard alone without anything else. Shutdown Insert only CPU, RAM and GPU without SSD etc etc etc. Good luck. Something to do with GROUND signal blocking the reset and CPU. History = http://forum.asrock.com/forum_posts.asp£TID=14013&title=3800x-not-boot-x370-taichi-error-33-7b-66" rel="nofollow - http://forum.asrock.com/forum_posts.asp£TID=14013&title=3800x-not-boot-x370-taichi-error-33-7b-66 ------------- x370taichi@3.50gen4 AX750 Optane900P SN770 3800x PosdonZro4 BarrowPWM-17w>420x140x28 XFX SWFT319 6900XT MSI RX560 LP to get Fluid Motion BlueskyFRC 75hz |
Posted By: Undchi
Date Posted: 23 Mar 2021 at 9:54pm
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Thank you! and Urgghh - have not tested that. I think you are correct, every time i was trying to reset CMOS I still had GPU (1080 TI) plugged into the PCIE port along with its power, had PCIE network card (Mellanox Connect X3) plugged in, had M2 SSD inserted and two sata SSD connected. I did not disconnected the GPU because otherwise how would I see anything on the screen... Given I returned the Ryzen 3700X to Microcenter already thinking on whether to try again... |
Posted By: cx5
Date Posted: 24 Mar 2021 at 10:55am
You're welcome. Try or not it's your call, I don't want to bias you. But I would like to tell you how I discover this = because I thought motherboard died and took it to warranty, including my own CPU and rams 4x8GB. And the funny thing is it boots up at the hands of the warranty officer. I go home thinking all OK, but overclock ram too much and hang and stuck in bootloop 33,7A,3B,B6 again...... and I took it to warranty again and luckily the officer was kind enough to retry and all OK..... without telling me to F off (good attitude guy) So I go home OK, overclock ok till too much and repeat 33,7A,3B,B6 finally I think what's what difference between me and him........ then it occured to me GPU, SSD_in_pcie_slot, power supply etc...... After remove all then resets works.. you know the rest. And you know how to figure out the GPU power cables ££ Later I crash again, so I think just pull out the GPU hangging in the sky WITHOUT removing GPU's power cable and reset cannot work. ------------- x370taichi@3.50gen4 AX750 Optane900P SN770 3800x PosdonZro4 BarrowPWM-17w>420x140x28 XFX SWFT319 6900XT MSI RX560 LP to get Fluid Motion BlueskyFRC 75hz |
Undchi wrote:Posted By: datonyb
Date Posted: 26 Mar 2021 at 2:02am
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mine will only boot with one stick of ram in slot a2 after a cmos clear i have to boot to bios with only 1 stick save exit then boot windows close down boot to bios set ram at 3600mhz save exit reboot to windows close and then and only then can i insert my second ram stick and it works perfectly it has done this ON ALL ryzern 3000 bios versions works fine at all times UNLESS I HAVE TO CLEAR.RESET THE CMOS ------------- [url=https://valid.x86.fr/jpg250]  [/url]3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold |
Posted By: Undchi
Date Posted: 26 Mar 2021 at 3:45am
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So weird (in terms of behavior with 3000x chips). for now I have decided to get X570 motherboard (birthday was coming up and siblings were asking what to get for myself) and look for eventual availability of either 5900X processor to build second system side by side. I wanted to do it in 2020-2021 anyway as my 1080 TI from 2017 was looking for upgrade. However I completely underestimated what GPU market would look like and it does not seem like I can actually buy anything to upgrade 1080 TI and thus not building new system in the last 12 months.. |
Posted By: cx5
Date Posted: 26 Mar 2021 at 1:18pm
Hello @da tony b, Long time no see. I remember your case everytime I quote my own. Your reply today encourages me to try in future your method first, although last time I tried before didn't work for me....... but now with additional encounters and experience, I will try without RAM reset, if fail and continue to be in bootloop 33, 7a, 3b, b6. 2nd try will be with one stick like you then reset and not reset before inserting the one stick. Your method is much easier than removing GPU and SSD_in_PCIe. I recently was force to try holding_down_permanently the RESET button whilst POST is in progress, the x370_taichi manages to get pass 33,7a,3b,b6 and reach 27, but not complete to 98 ultimately A6. What a funny encounter we have when x370_taichi mix with zen2. ------------- x370taichi@3.50gen4 AX750 Optane900P SN770 3800x PosdonZro4 BarrowPWM-17w>420x140x28 XFX SWFT319 6900XT MSI RX560 LP to get Fluid Motion BlueskyFRC 75hz |
Posted By: datonyb
Date Posted: 27 Mar 2021 at 2:10am
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hiya cx5 imagine my disappointment with the pc that had worked perfectly and well above what other people were suffering.......when suddenly it wouldnt boot with the 3800x i stumbled on the solution by grabbing my spare test stick of unbranded generic ddr4 2133 and it booted directly thus eventually enabling me to work out the first initial boot HAS to be at 2133 with a single stick (for reference it wont boot two 2133 generic sticks either, it has to be 1 single stick on first boot) ------------- [url=https://valid.x86.fr/jpg250] [/url]3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold |
Posted By: Undchi
Date Posted: 27 Mar 2021 at 7:57am
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Wow, I almost feel like there must be an FAQ somewhere related to all of this. For the board that is supposed to support it 'out of the box' with the right BIOS definitely gives me a pause to try again to go from 1700X->3000X generation. Completely unrelated, I will probably start a separate thread to see if I can figure out a safe way to build 570X + 5000 CPU or is this another song and dance and pray type of approach. I have received a gift from sibling of 570X Taichi and looked at BIOS download page, I think I understand it as it would not boot 5000X out of the box and must be booted with earlier generation CPU on earlier generation BIOS before update and then start of the song and dance. Question is , how do I tell what BIOS version it is or at leas when it was manufactured based on serial/part number of the motherboard£ |
Posted By: cx5
Date Posted: 30 Mar 2021 at 4:25pm
Hi @datonyb Holly-Cow, what a story, you should have told this earlier, it's an impressive findings, one that AMD and ASRock should be happy to hear about ....... may be they already knows........ that's why so many attempts to not support new cpus in old motherboard...... dam...... one single 2133 (original jedec first version) is master for all trouble-shooting, so classic !!! ------------- x370taichi@3.50gen4 AX750 Optane900P SN770 3800x PosdonZro4 BarrowPWM-17w>420x140x28 XFX SWFT319 6900XT MSI RX560 LP to get Fluid Motion BlueskyFRC 75hz |
Posted By: cx5
Date Posted: 30 Mar 2021 at 4:31pm
Hello @Undchi , Yeah, you're so right man......... this bios bootloop code 33,7a,3b,b6 that burned into my brain ........ But funny, does it happen to taichi_x370 only, it is because this is the only x370 worth upgrading all the way to Ryzen 5000££ and I'm extremely reluctant to upgrade Ryzen 5000 now, too much headache.... ____________ The BIOS version can be seen via a small sticker i.e. 1.5 or 2.0 or 0.9 directly ontop the bios chip on the motherboard. Not outside the box. ------------- x370taichi@3.50gen4 AX750 Optane900P SN770 3800x PosdonZro4 BarrowPWM-17w>420x140x28 XFX SWFT319 6900XT MSI RX560 LP to get Fluid Motion BlueskyFRC 75hz |