Is this a BIOS value corruption issue?
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=2143
Printed Date: 18 Jul 2025 at 11:00pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Is this a BIOS value corruption issue?
Posted By: Shadetree
Subject: Is this a BIOS value corruption issue?
Date Posted: 05 Mar 2016 at 1:59am
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My Z77 extreme4 doesn't want to boot properly all of a sudden. It comes up with a message to insert the proper boot media so it's looking at the wrong drive. If I go into UEFI the proper drive is set so all I have to do is exit and save setting. It then boots correctly. What's the best first thing to try? |
Replies:
Posted By: Xaltar
Date Posted: 05 Mar 2016 at 2:27am
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Try clearing CMOS via the battery removal method, if that fails to resolve the issue then you can try replacing the CMOS battery. ------------- 
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Posted By: Shadetree
Date Posted: 05 Mar 2016 at 3:30am
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Thanks, that's the direction I was headed. I just wanted someone that knows a bit more about it to confirm. Can anyone tell me what battery is in there in case I need to get a new one? It's buried under the video card. |
Posted By: Xaltar
Date Posted: 05 Mar 2016 at 5:16am
When you remove it to perform the CMOS clear you can get the info directly off the battery itself 
It may not be necessary to replace it, if the CMOS clear resolves the issue. -------------
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Posted By: parsec
Date Posted: 05 Mar 2016 at 1:42pm
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The battery is a CR 2032, used in all ASRock mother boards. It is a common battery that should be about $3 or less. You can see the battery model number in the top down picture of your board on its information page: http://www.asrock.com/mb/Intel/Z77%20Extreme4/" rel="nofollow - http://www.asrock.com/mb/Intel/Z77%20Extreme4/ ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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Posted By: Shadetree
Date Posted: 06 Mar 2016 at 5:34am
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Well, the clear CMOS worked fine. It's booting normally again now. Thanks for the input. So, what causes that problem in the first place? Is it likely to become an ongoing issue? It's run without a hiccup for several years now and out of the blue this happens. Can anything be done to prevent it? |
Posted By: Xaltar
Date Posted: 06 Mar 2016 at 2:10pm
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Your post title about sums it up. Data corruption can occur in the UEFI for a number of reasons: 1. Bad battery 2. Power loss 3. OS crashes 4. OS data not being properly written etc The UEFI, unlike the simpler BIOS system, is interactive with the OS and allows values to be set by the OS itself. This means the UEFI is written to fairly often, the more this happens the higher the chances of corrupt values occurring. The only way I can see it becoming an ongoing issue is if the battery actually dies, other than that a simple CMOS clear usually corrects the issue. In all likelihood you will go for another several years before it happens again. Whenever I perform maintenance on my systems I usually perform a CMOS clear at the same time, this avoids issues like this entirely. -------------
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Posted By: Shadetree
Date Posted: 06 Mar 2016 at 11:45pm
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Good info. I thought the UEFI was just a fancy BIOS. What's the minimum procedure for CMOS clear? Four hours seems a bit over the top. |
Posted By: Xaltar
Date Posted: 07 Mar 2016 at 12:40am
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Typically I just do a generic jumper clear during maintenance unless there is some kind of pre-existing problem that requires a full clear. -------------
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