What are causes of missing ntldr?

The "NTLDR is missing" error typically occurs due to several causes, including corrupted or damaged boot files, improper BiOS settings, or a malfunctioning hard drive. It can also result from a missing or incorrectly configured NTLDR file, often due to a failed operating system installation or accidental deletion. Additionally, if the boot order in the BiOS is set incorrectly, it may try to boot from a non-bootable device, leading to this error.