Mid 2010 Macbook Pro keeps booting into Startup manager

[Mighty Boo]

High Sierra 10.13
Mid 2010 Macbook Pro
Only 1 boot partition: "Macintosh HD" APFS
No Boot Camp
No firmware password
No FileVault
Yes Automatic Login enabled

Priority:
Not urgent, but is a nuisance

Problem:
Reboot or Power ON results to default booting into Startup Manager after the "chime sound"... 100% every time. Have to select "Macintosh HD" every time.

Attempted:
Cleared NVRAM & SMC.
Checked faulty OPTION key.
CONTROL clicked "Macintosh HD" in Startup Manager.
High Sierra > System Preferences >Startup Disk > Selected Macintosh HD MacOS, 10.13.
sudo bless -mount "/Volumes/Macintosh HD" -setBoot

Not yet attempted (Last resort)
Reformat entire SSD, and clean install


Anybody encountered such a glitch before?

 

[Cougarcat]

Did you select your hd in startup disk and then press restart?

 

[Mighty Boo]

Did you select your hd in startup disk and then press restart?

Yes. Done that.

Would be great if there is a terminal command to fix this.

 

[Cougarcat]

Yes. Done that.

Would be great if there is a terminal command to fix this.

There’s this:
https://www.techwalla.com/articles/how-to-change-the-mac-startup-disk-from-the-command-line

But it’s the same thing as selecting it in Startup Disk. I’m guessing something went not quite right during the APFS conversion.

 

[Mighty Boo]

There’s this:
https://www.techwalla.com/articles/how-to-change-the-mac-startup-disk-from-the-command-line

But it’s the same thing as selecting it in Startup Disk. I’m guessing something went not quite right during the APFS conversion.

sudo bless -mount "/Volumes/Macintosh HD" -setBoot

Still, does not work on both Restart and Shutdown...