Error 1962: No operating system found

[p.H]

Do you mean that GRUB does not display its menu ?
Is /boot/grub/grub.cfg present ? If not, run update-grub.
Check the value of $prefix with the command "set". Also, you can try

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configfile (hd1,gpt2)/boot/grub/grub.cfg

[Silvergator]

Is this in response to my previous post where I stated that the computer is booting normally from an SD card prepared as you recommended. Without the SD card, I still get the Error message.

Do you mean that GRUB does not display its menu ?

No. GRUB is not found. Below is a screen shot.

Is /boot/grub/grub.cfg present ? If not, run update-grub.

Yes, the cfg file is present; update-grub has been run many times.

Check the value of $prefix with the command "set". Also, you can try

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configfile (hd1,gpt2)/boot/grub/grub.cfg

In response to your questions above, here are the responses when booted with the SD card.

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bill@debian:/boot/grub$ ls
device.map  grub.cfg      i386-efi  loopback.cfg  unicode.pf2
fonts       grubenv       i386-pc   sgd           unifont.pf2
grub1.cfg   grub_old.cfg  locale    themes        x86_64-efi

bill@debian:/usr/local/bin$ echo $prefix

bill@debian:/usr/local/bin$ configfile (hd1,gpt2)/boot/grub/grub.cfg
bash: syntax error near unexpected token `hd1,gpt2'
bill@debian:/usr/local/bin$ 

bill@debian:/boot/grub$ set prefix
bill@debian:/boot/grub$

In conclusion, although I never achieved a boot from GRUB on the HDD, I am satisfied and consider the problem solved.

[p.H]

I meant when you boot GRUB from the SD card.
The commands were meant to be run at the grub> prompt, not in the Linux shell.