Imac with 3Gb fusion drive "no bootable device--insert boot disk and press any key. This started over the past 2 weeks, and now occurs every day. Initial boot to MAC OSX is Ok.
I receive the above black screen 'no bootable device' error message daily, after not using my imac for a while. I will note that the computer will boot normally, and after a while, the screen saver initiates. Some time later, I get the black screen error message. I have to hard boot the computer again at this time. Any ideas?
Thanks for your help,
JTH
iMac (27-inch, Late 2012), OS X Mountain Lion (10.8.5), 3Gb fusion drive.