Macbook screen switch off when moved

Question

When moving my macbook it sometimes switch off unexpectedly (black screen) and switch on again after several seconds.

I remember solving the problem several month ago by changing a internal MacOS X settings with such a command:

defaults write com.apple.??????

This command disabled the automatic shock detection system that prevent hard drive damage.

Does someone knows this command? a better alternative?

score 1 · Accepted Answer · edited Feb 08 '13 at 14:34

Disable the Sudden Motion Sensor to avoid the harddrive heads parking them due to loud noise in a club.

To check if Sudden Motion Sensor is activated, use the following command and look for the sms setting (1 = enabled) :

# sudo pmset -g

To disable Sudden Motion Sensor, use the following command :

# sudo pmset -a sms 0

To enable Sudden Motion Sensor, use the following command :

# sudo pmset -a sms 1

Hope this helps!

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