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Is this a BIOS value corruption issue?
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Xaltar View Drop Down
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    Posted: 07 Mar 2016 at 12:40am
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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Points: 6 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Shadetree Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 2016 at 11:45pm
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.
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Points: 30703 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 2016 at 2:10pm
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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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?
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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/
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When you remove it to perform the CMOS clear you can get the info directly off the battery itself Wink
It may not be necessary to replace it, if the CMOS clear resolves the issue.


Edited by Xaltar - 05 Mar 2016 at 5:16am
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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.
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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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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?
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