Unapproved Caller SecurityAgent may only be invoked by Apple Software
My Problem
Leopard installer failed when trying to install to internal disk, but installed to same disk when used via USB. Managed to install Leopard and upgrade to Yosemite before Macbook Pro started to become unstable.
Macbook Pro began failing to boot, displaying error "Unapproved Caller SecurityAgent may only be invoked by Apple Software" and a black screen, with recovery failing to install or recover on system disk.
My Fix
Changing the hard drive cable was extremely easy, and fixed the problem immediately.
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