Hi Segw2019,
The Non-System Disk Error or Disk Error message might appear when the computer BIOS cannot find a bootable operating system on any of the storage devices included in the notebook computer's boot path. During startup, a notebook checks several devices for an operating system in a pre-determined order
https://support.hp.com/in-en/document/c00832290
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Regards,
Karthik Nataraj
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