Can't boot from internal ssd APPLE SSD AP0128H
My Macbook Pro 15 retina mid 2014 has a 128gb APPLE SSD AP0128H installed.
The laptop is presently booted from an external ssd without any trouble. The OS recognizes the internal ssd just fine, and I can move files to and from the internal drive without problems. But when I try to install Mac OS to the internal ssd, I run into problems. The install program sees the ssd and allows installing Mac Os to it, but when the installation is complete, and the laptop restarts, all I get is a blinking folder with a question mark.
Is it a bad drive? and if it is, how come I can use the internal drive for normal file storage but not as a boot drive?
Ist dies eine gute Frage?