PC WON'T POST UNLESS CMOS RESET
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=23398
Printed Date: 23 Jun 2024 at 11:03am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: PC WON'T POST UNLESS CMOS RESET
Posted By: brunocanto
Subject: PC WON'T POST UNLESS CMOS RESET
Date Posted: 02 Apr 2022 at 3:20am
PC won't post unless cmos reset.
PC specs:
Mobo ASRock B550M Pro4, AMD AM4, Micro ATX, DDR4
Proc AMD Ryzen 5 5600X, Cache 35MB, 3.7GHz, no video - 100-100000065BOX
Mem RAM Patriot Viper Steel 16GB - PVS416G320C6
SSD WD Blue SN550, 500GB, M.2, PCIe, NVMe - WDS500G2B0C
PSU XPG Core Reactor, 750W, 80 Plus Gold
Computer worked normally for 1 week, in this morning it did not boot anymore.
It only enters the setup screen if I do a clear CMOS.
After clear CMOS and turn ON PC then mobo lights(boot, vga, cpu, ram) blink and then turn off and finally POST and can enter SETUP. CPU identified, mem RAM identified, SSD m.2 identified aparently everinthing is OK.
After it I reset computer then CPU and RAM lights keeps ON and PC not POST, no video, no mouse, no keyboard, but fans all ON. Sometimes only CPU lights keeps ON.
Please any advice.
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Replies:
Posted By: voss749
Date Posted: 05 Apr 2022 at 9:59pm
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What bios version are you running?
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Posted By: brunocanto
Date Posted: 05 Apr 2022 at 10:06pm
Posted By: voss749
Date Posted: 05 Apr 2022 at 10:18pm
Switch to compatibility mode, turn off fTPM in bios. I suspect you recently updated your bios right?
"Enable AMD CPU fTPM in BIOS default" in bios 2.20 this may be the issue.
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Posted By: voss749
Date Posted: 05 Apr 2022 at 10:19pm
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Also did you disconnect anything?
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Posted By: brunocanto
Date Posted: 05 Apr 2022 at 10:27pm
I didn't update the bios.
I disabled fTPM, but I haven't tried compatibility mode.
Disconnect what?
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Posted By: threadzipper1957
Date Posted: 05 Apr 2022 at 11:11pm
FTPM is not the cause of this, it's a setting in BIOS, and in newer BIOS it is enabled by default, because Windows 11 demands it, also when upgrading from 10 to 11.
This is a process of ellimination.
You didn't provide details on what graphics card is used, and what happens when you are in BIOS, load default settings f9, save with f10, and use only 1 memory module in A2.
The error that you see basically means that something is not able to be initialzed, and this happens for instance when XMP memoy profiles are used.
Another casue is sometimes wireles keybaord/mouse USB dongles, they cause so much interfeerence that they block alal USB communication.
UEFI sends out a signal, when it starts, and all hardware must reply with information, so also monitor, keyboard and mouse, then UEFI will activate al hardware, even before it completely boots.
Try with a minimum of hardwar, so also no M.2 or SATA, or USB cardreaders.
And see to it Windows is installed in GPT (UEFI) mode
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Kind Regards
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