I have a MacBook Pro 8,2 (15 inch, early 2011) running Yosemite (with encryption enabled). I have a strange problem that seems to relate to my boot drive (Samsung 840 Pro SSD).
The system runs great but when I try to reboot normally, it never boots. It simply waits several seconds and then comes up with the flashing question mark folder icon. If I hold down the option key to get the EFI password prompt and then the listing of attached drives, I can select the correct drive (there normally is only the one internal drive) and it seems to boot successfully 100% of the time.
I've seen on here that many people have trouble with the SATA cable on this model. Is it possible for my SATA cable to be bad, but have no discernible problems with normal operation or booting from the boot menu? If not, what else could cause this problem? Is there a recommended utility to check the cable?