Windows 10: BIOS - CSM setting changed

Steve C, those are the settings i have: OS: Windows 8, UEFI only (CSM set to Never does that?), Secure boot enabled.
I've loaded BIOS defaults then set OS to Windows 8, CSM set to Never. Secure boot is enabled by default.
I also enable virtualisation as my CPU supports it though i've never had the need to use it yet.

 

I have set my BIOS to disable CSM support as i want my drive to be GPT not MBR. if i don't disable CSM in the BIOS then even if i set the drive to GPT using diskpart, Windows install will change it to MBR type without telling me! my mobo is a "Gigabyte GA-Z77X-UP5 TH". I had the BIOS setting for OS to "Windows 8 WHQL". there is no info in the guide book about this particular setting. the other options are "Windows 8" and "Other". then i set BIOS CSM to never. The problem i've had and this has happened more than once is that the BIOS OS setting changed from "Windows 8 WHQL" to "Other" & i think CSM was enabled. Has Windows 10 done this or the BIOS? maybe its a software or hardware fault with the BIOS? another problem i've had is that a SATA drive port i had set to disabled was re-enabled. sometimes this would result in new drive letters appearing.

:)

 

Windows 10 won't boot

If all goes well then great... but change the BIOS settings back to the way they originally were afterward...assuming success of course. Was the BIOS in Legacy or CSM mode previously? If so, then switch it back to that after achieving success.

Wayne

 

Windows 10 installing stuck on blue logo no spinining circle (32bit to 64 bit)

Try changing the hard disk controller in the BIOS from AHCI to IDE or Legacy.

If you have a UEFI system have you tried using CSM mode? (substitute BIOS instead of UEFI)

 

Is it installed as UEFI or Legacy ?

 

UEFI, thats what setting CSM to never does?

 

CSM = Compatibility Support Module, that's needed for UEFI and practically means same thing.

 

When enabling secure boot, Gigabyte told me to use the Windows 8 option and not Windows 8 WHQL. I set that and UEFI only and all is fine.

 

whats the secure boot option for? (its enabled by default i think). that option only appears when set to Windows 8?

 

Secure boot | Microsoft Docs

 

ok i'll check i have it enabled next time i reboot.

 

Could you please post a shot of disk management.

Disk Management - How to Post a Screenshot of

With CSM disabled it would force UEFI





For some reason your manual is missing several points found in other Gigabyte manuals. I pulled down several. I know there can be differences model to model but generally they are the same.

 

the section in the mobo user's manual "BIOS - Peripherals" doesn't mention CSM nor the setting for Windows 8.

 

Nothing to do with peripherals, look for it somewhere else.

 

I just posted your manual is missing stuff.

You can look but I searched repeatedly with CRTL-F.

You have to find a board similar to yours. The BIOS will be the same for these components. I downloaded several so I'm confident. CSM is the same even across manufactures.

In one manual they even tell you the OS setting but I could find. On mine I set to other OS and I've seen that before.