SSD install in iMac; SSD is not always recognised.
I installed a Samsung 850 EVO drive into my late 2012, 21.5" iMac to replace the internal drive. Sometimes when I boot the iMac the drive is not recognised- strangely though, sometimes it is. It seems to be roughly 50/50. Is this a loose connection somewhere, or perhaps I just need to reset some things in the OS / software like PRAM? NOTE: I have now tried resetting PRAM and it has had no effect.
Often when booting a prohibitory sign is displayed (circle with a line going through it diagonally) or a folder with a question mark.
Is this a good question?