Intel Motherboards - POST Debug Code 18 on AsRock z390 taichi ultimate

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POST Debug Code 18 on AsRock z390 taichi ultimate

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=16966
Printed Date: 02 Aug 2025 at 1:42am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: POST Debug Code 18 on AsRock z390 taichi ultimate

Posted By: yes298
Subject: POST Debug Code 18 on AsRock z390 taichi ultimate
Date Posted: 15 Oct 2020 at 1:43pm

Hi All,

Urgently need your great help for below issue:

MB: AsRock z390 taichi ultimate
CPU: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (65W)
RAM: Gskill 4GB x 4

When I switch my newly built PC on, the fans start up, but I get nothing on the monitor via HDMI, and the POST display on the motherboard runs quickly through various codes then automatically re-boot two times, and then stops at code 18, which does not appear in the manual.

Anyone knows what's problem for this and kindly advise how to solve it, many thanks!

Ken

Replies:

Posted By: ASRock_TSD
Date Posted: 15 Oct 2020 at 1:50pm

Dear Yes298,

Thank you for posting!

Z390 platform mainly supports Coffee Lake CPU.

When 6700(Skylake) CPU is used, it will not work properly.

Kindly use the Coffee Lake CPU on the system.
For the support list, kindly refer to the link below:
https://www.asrock.com/mb/Intel/Z390%20Taichi%20Ultimate/index.asp#CPU

With thanks,
ASRock TSD

Posted By: yes298
Date Posted: 15 Oct 2020 at 2:21pm

Thank you so much for quick response.
oh, too bad to heard this.
I was missunderstood that it is compatible with all socket 1151 CPU.