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Asus Z97M-Plus BIOS keeps resetting to default options

Chaotic42

Lifer
Jun 15, 2001
33,854
957
126
Hey all. For some reason my Asus Z97M-Plus motherboard is all of the sudden not saving its BIOS options. As soon as I boot into Windows, it reverts back to its defaults. Specifically I'm dealing with Vt-d being reset to disabled. I don't know where this came from.

I've tried reflashing the BIOS and changing out the battery, but I'm still having no luck. Has anyone run into anything like this before? Is there any way to hex-edit the BIOS I downloaded to default to my desired settings and then flash it?
 

LTC8K6

Lifer
Mar 10, 2004
28,520
1,573
126
I think a faulty power supply can cause it. Or a faulty board, of course.
 

Ketchup

Elite Member
Sep 1, 2002
14,494
220
106
Save and run at "optimized defaults" and tell us if the problem continues at those settings.
 
Feb 25, 2011
16,573
1,334
126
Does it have one of those BIOS reset switches? Is there some cat hair or rust causing it to stick?
 

Chaotic42

Lifer
Jun 15, 2001
33,854
957
126
Unfortunately none of these ideas worked, except changing out the PSU which I haven't tried. I do appreciate the suggestions though. I might try setting the Vt-d to enabled, saving out the BIOS, and then flashing it.
 

Chaotic42

Lifer
Jun 15, 2001
33,854
957
126
It's got to be something during the boot or in Windows itself. I set Vt-d to enabled and left the system off for days. When I turned it on, it was still enabled. Now that I'm in Windows 10, it appears to be disabled again.
 

Chaotic42

Lifer
Jun 15, 2001
33,854
957
126
What about vmware? Got a pic? Is it not loading the machine?


This just started out of no where right before I posted the OP. I'll see if I can get around to trying the PSU thing, but I have no idea why that would cause this "Windows poisoning the BIOS" issue.
 

Ketchup

Elite Member
Sep 1, 2002
14,494
220
106
Ok thanks. Have you been able to verify any othey BIOS settings going back to "stock"?
 

Ketchup

Elite Member
Sep 1, 2002
14,494
220
106
Just to make sure I am clear, if you set it and save settings in the bios, is it enabled om that boot. If so, and you reboot, not shutdown, does it stat enabled? Have you tried and older bios?
 

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