Windows 8.1 installed in legacy bios not UEFI (Asus Z87 PRO)

[smithy123]

Hi,

ASUS Z87 PRO motherboard.
Could somebody please help me out?
I installed windows 8.1 from DVD and formatted the hard drive to GPT before the install.
Unfortunately windows was installed in legacy bios and not UEFI.
Is there some bios setting I need to change to ensure install is in UEFI mode?

Thanks for any help.

 

[RU482]

is there anything in your BIOS that says "CSM"? if yes, set it to disabled.
CSM stands for Compatibility Support Module....meaning that it is compatibility mode for older pre-UEFI BIOS.

You will need to reinstall the OS also

 

[smithy123]

Thanks for your reply.

Will reinstall the OS on a new HDD.

Will update this post after new install.

 

[vailr]

What video card are you using?
Does it include a UEFI GOP bios firmware?
Unless you're using the onboard Intel graphics, the video card must include the UEFI GOP feature.

 

[smithy123]

I'm using the onboard graphics.

Wasn't aware that an external graphics card needs UEFI GOP bios firmware.

Thanks.