HELP Mac doesn't recognize startup disk

[marioman38]

I have a perfect working macOS Sierra. Volume named Macintosh HD. Mac keeps booting to a screen that says install mavericks. I click startup disk. It doesn't recognize any. In disk utility. It is there. Macintosh HD. Verifys just fine. Something is forcing my mac to install mavericks even though I have a perfect running copy of sierra. I reset the pram. Same thing. Install mavericks it says. I click startup disk. It doesn't recognize Macintosh HD as being a valid 10.12.1 disk. Like it needs to be blessed.

 

[Floris]

If you select a disk during the maverick install .. it will try to install maverick on it. Not what you want.

https://support.apple.com/en-us/HT201255
try to go to startup manager, and select the right disk for macSierra

 

[marioman38]

I got it working. Booted of an external FW800 drive and had to "install" macOS Sierra again, on top of my existing and fully functional 10.12.1 disk. The macbook was stuck in a loop wanting to install mavericks. I booted holding the "shift" key and would get kernel panics like crazy. Startup manager just was not recognizing my 10.12.1 disk. When booting to 10.9.5 off the external HDD it would recognize my 10.12.1 disk, select it and hit restart, it still booted to "install Mac OS X Mavericks" clearly a bug of some sort.