Yosemite to USB3 SSD Query

[active8]

So,

I installed Yosemite to a SSD in a USB3 enclosure recently and launched the Yosemite installer from within the application folder on my internal macintosh hard drive on my mac mini to install onto the SSD.

The only problem I have now is that if I want to boot my old mac internal installation it will no longer do so, instead 'Macintosh HD' now boots directly to the Mac OS X Installer instead.

Any ideas how to sort this out?

 

[Bruno09]

Hi,

you might try either :

- hold the Option key down on chime to select "Macintosh HD" (internal drive, grey icon)

- while running the external drive OS, go to System Preferences, select the (internal) Macintosh HD as startup disk, and reboot

 

[active8]

I've done this - the internal drive boots straight to the OS X installer and no I didn't overwrite the internal drive with the installer image as I can browse the internal drive from the external yosemite installation.

 

[Bruno09]

This is very strange...

Is it the official Yosemite installer downloaded from the App Store ?

 

[active8]

yes

 

[Taz Mangus]

So,

I installed Yosemite to a SSD in a USB3 enclosure recently and launched the Yosemite installer from within the application folder on my internal macintosh hard drive on my mac mini to install onto the SSD.

The only problem I have now is that if I want to boot my old mac internal installation it will no longer do so, instead 'Macintosh HD' now boots directly to the Mac OS X Installer instead.

Any ideas how to sort this out?

Try booting into safe mode: https://support.apple.com/en-us/HT201262