How can I see the system status during boot?
Solution 1:
You have to press cmd + v upon startup to see the boot output. Press this right after the chime.
If you want to make that permanent, you should probably do something along the lines of:
sudo nvram boot-args="-v"
To undo the above:
sudo nvram boot-args=
in the Terminal. (/Applications/Utilities/Terminal.app)
note: I haven’t tested the above commands, but I’m sure a google query will help you there if you want to make it permanent.
Solution 2:
If you want to see the boot messages after the boot occurred, log in and run sudo dmesg in Terminal.app.