Secure Boot should have nothing to do with it, assuming you were running off of the internal storage drive.
If it was working under UEFI previously, It's odd that it will work under CSM now without a reinstall of the OS. Typically Windows is installed under it, or it's installed under UEFI, while switching mid-use prevents booting to the OS. You might want to at least ask Asus support if they have any ideas.
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If it was working under UEFI previously, It's odd that it will work under CSM now without a reinstall of the OS. Typically Windows is installed under it, or it's installed under UEFI, while switching mid-use prevents booting to the OS. You might want to at least ask Asus support if they have any ideas.
