ADFS 2012 - Active Directory Federation Services (adfssrv) stuck at STARTING

Simple!

That's because "Microsoft Key Distribution Service" (KdsSvc) stopped.
But if you tried to start it, it just hang... duh!

so...
boot to safe mode
then set "Microsoft Key Distribution Service" (KdsSvc) to automatic.
then open command prompt
and run
     sc triggerinfo kdssvc start/networkon

reboot, and you are good!