macOS Sierra Recovery Mode does not work 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:

altcmdPR


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?
Thanks Kevin Grabher,

You gave me the solution....

I tried booting the system using only the HDMI monitor, removed the Mini DisplayPort VGA adaprter.

Using only the HDMI cable and monitor, everything works.