It took me a lot of time and wrestling with init.d, rc.local and crontab to start MC minimized at boot, but I found a solution! Is it true that "mediacenter22 /mediaserver" only starts the mediaserver and thus the server does not spend resources on the graphical interface? I built myself a silent server with a minimal version of Debian Jessie and JRiver MC. I added MC to the Startup Applications (Tweak Tool). Next I edited the (hidden) file /home/youruser/.config/autostart/media_center_22.desktop by adding "/mediaserver" to two rules that start with "Exec". Maybe this is very obvious to a Debian expert, but to me it wasn't. It's Christmas time and so I like to share this tweak with you. Happy holidays!