OSX Yosemite Dock magnification disabled

Question

I am running latest Yosemite 10.10.4 on latest MacMini model. Somehow the magnification is enabled BUT the checkbox is not editable so I cannot turn it OFF or change the size. I am a Mac user for MANY years and have never seen this. How to change it? I have also run PRAM reset, repaired permissions. Nothing I have found on web is working.

See this link for screenshot

Answer 1

System preferences / Dock / check magnification checkbox

Else in terminal run

defaults write com.apple.dock largesize -float 128.000000

killall Dock

Answer 2

See if this works

To temporarily enable Dock magnification on your Mac, hold down Control+Shift as you mouse over the Dock icons. To turn it off again, just release the Control and Shift keys.

Source: http://mactoids.com/keyboard-shortcut-for-dock-magnification/

Also to increase the maximum magnification size, try running this in terminal

defaults write com.apple.dock largesize -float 128.000000 

killall Dock 

Source: http://www.maclife.com/article/features/4_terminal_tricks_customizing_your_os_x_dock