I have a Mac mini 2014, running macOS Sierra from a SSD drive, and using an Apple Keyboard M9034 D/A.
Since I replaced the rotational hard drive (HDD) with an SSD, I do not see the Apple logo on the screen to show it's loading.
The start up shortcuts below do not work:
⇧ Shift Start up in Safe Mode;
⌥ Option (alt) Start up to Startup Manager;
⌘ CommandS Start up in single-user mode;
⌘ Command R - Start up from macOS Recvery
⌥ Option (alt)⌘ Command R Start up from macOS Recovery over the Internet.
The only combination that works is the PRAM reset:
Already tried with 3 different keyboards.
Installed a complete fresh copy of the Operating System.
macOS Recovery only works if the system has some kind of issue, meaning if the boot does not work.
C Start up from a bootable USB only works if there is not an operating system on the hard drive.
Anyone have suggestions to try?