Z490 Bios update Mos fan problem
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=15185
Printed Date: 02 Aug 2025 at 8:56pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z490 Bios update Mos fan problem
Posted By: NadeMagnet
Subject: Z490 Bios update Mos fan problem
Date Posted: 14 Aug 2020 at 11:02am
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I just updated the BIOS to P1.70 with the live update and app shop utility. Now in neither simple Bios, or in advanced H/W monitor does my Mos_Fan1 or 2 fan speed show up. It says N/A. I just took my side case off and the fans aren't spinning at all now. They should be set to performance with the rest of my fans. How do I re enable them?
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Replies:
Posted By: ASRock_TSD
Date Posted: 14 Aug 2020 at 11:55am
Dear NadeMagnet,
Thank you for posting your query to the ASRock forum.
Regarding your question, kindly fill out the form in the following link.
https://event.asrock.com/tsd.asp
Please provide the following information for us:
1. Motherboard model name.
2. Fan used. Is it 3 pins or 4 pins?
3. Please provide the header name that doesn't have the fan speed showing.
With thanks,
ASRock TSD
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Posted By: NadeMagnet
Date Posted: 14 Aug 2020 at 12:49pm
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I went ahead and filled out the form. But I think you're misunderstanding. The BIOS can still read all the case fans I have attached. What it's now not reading after the Bios update is the two small fans that COME with the motherboard itself. The Bios calls those two Mos_Fan1 and Mos_Fan2. Both now show N/A in the Bios instead of showing their RPM like it did before the update.
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Posted By: ASRock_TSD
Date Posted: 14 Aug 2020 at 2:30pm
Dear NadeMagnet,
Your email has been received, our team shall respond to you soon.
With thanks,
ASRock TSD
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