On Jan 25, 2014, at 17:32 , smac0031 wrote:
What does this sudo shutdown -h now command do. The terminal tells the Mac to shutdown?
In short, yes. Using the terminal gives you more flexibility in issuing commands (only the daily, typical things are given a menu or button some place.). The "shutdown - h now" part is roughly the same as choosing "Shut Down" from the Apple menu... but the "sudo" part is the crucial difference ... it does the shut down under the auspices of the super user (a.k.a. Root user, or in this case "Admin" user),
(which is why it asks for your password again).The shut down process of the machine involves an ordered closing up / quitting, in roughly reverse order to the start up process. By running shutdown as root user, no program (including the many invisible ones) can refuse to quit and thus hold up the shutting down.
Of course this isn't a solution to your problem, but it will help prevent further damage -- doing a 'cold' shutdown (by pulling the plug or holding down the power button until it goes dark) is really hard on the system...
lost settings, and corrupted filesystems often result.In fact, it should be standard procedure after every cold shutdown to open the Disk Utility and do a "Repair" or at least a "Verify" on all disks that were connected at the time you turned off the machine.
By the way, the advice others have given on removing third-party (non Apple) cards, and on starting in "Single User" mode are right on point and should be followed.
Manoah F. Adams This message is signed with a certificate and-or PGP key. Disregard any unverified messages from this address. ===========
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