https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Tue, 07 Apr 2026 06:53:56 +0000 Sat, 04 Nov 2017 14:36:18 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=6488 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=6488&PID=38856&title=solvedh170-boot-issue-when-csm-is-disabled#38856 Author: keeka
Subject: 6488
Posted: 04 Nov 2017 at 2:36pm

Seems the monitor must be powered up when the PC boots in UEFI mode (CSM disabled).
I use an APC BACK-UPS, which cuts power to the peripherals when the PC switches off.  Seems that the monitor is not quite ready in time, when the PC boots, for the video BIOS to consider the monitor available over DPP.  I have plugged the monitor in to a mains socket independent of the UPS's and the machine boots fine.



Edited by keeka - 04 Nov 2017 at 3:03pm]]> Sat, 04 Nov 2017 14:36:18 +0000 https://forum.asrock.com/forum_posts.asp?TID=6488&PID=38856&title=solvedh170-boot-issue-when-csm-is-disabled#38856 https://forum.asrock.com/forum_posts.asp?TID=6488&PID=38829&title=solvedh170-boot-issue-when-csm-is-disabled#38829 Author: keeka
Subject: 6488
Posted: 03 Nov 2017 at 11:53pm

Hi
I am trying to boot with CSM disabled.  Motivations and what I am experiencing are similar to OP in this post.

I can disable CSM and then successfully restart and also boot from cold.  However, if I leave the machine for any length of time (hours, over night say), then when I cold boot, I get 5 beeps (AIUI this means failure to init video).  The machine then restarts of its own accord, having re-nabled CSM itself.  All other UEFI/BIOS customisations seemed to be preserved.

I would like to have CSM off as I have discovered that, without it,  my displayport monitor switches on immediately and I can see boot managers etc with out resetting the machine straight after a cold boot.  Plus, it would be good to go pure UEFI as I do not appear to need legacy/BIOS support.
I am sure the installed OS are UEFI mode and the graphics (which the beeps indicate are the culprit) should have a GOP VBIOS provided in the ASROCK UEFI for this board:

Asrock H170M PRO4
BIOS 7.1
CPU i5-6600
No discrete graphics in use, I have BIOS set to init built in IGPU first.

Advice and suggestions much appreciated.

Many thanks.




Edited by keeka - 04 Nov 2017 at 2:37pm]]> Fri, 03 Nov 2017 23:53:10 +0000 https://forum.asrock.com/forum_posts.asp?TID=6488&PID=38829&title=solvedh170-boot-issue-when-csm-is-disabled#38829