External Bootable HDD - are no more
Howdy,
I have an external 4TB HDD which has Mac OSX 10.8.2 (Mountain Lion) installed…. and up until recently - it would boot up my iMac (running Mavericks) so that I could then continue to use older applications that no longer run under Mavericks. (some are critical and very important to me)
I don’t know why, but since updating the iMac to 10.9.2… I dont seem to be able to boot from any external drive at all (I have a couple) even though the startup disk (system preference) sees all the connected external drives - as options from which to boot from. However, when I select any external drive as startup disk - it restarts and all I get is a blank light grey screen !!
The same thing also happens when I press the Alt Key at starup - which displays all attached bootable HDD from which to make a selection to boot from.
How do I particularly rebless my 10.8.2 drive (to eliminate it as potentially faulty) and also ensure all my External Drives are indeed bootable ?
All help much appreciated