x370 Taichi + 3700X , no post. Hints£

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

Undchi wrote: Thank you! and Urgghh - have not tested that. Given I returned the Ryzen 3700X to Microcenter already thinking on whether to try again...

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.

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..

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)

datonyb wrote: hiya cx5 i stumbled on the solution by grabbing my spare test stick of unbranded generic ddr4 2133 and it booted directly

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 !!!