Concerned about forced shutdowns

[Bruno09]

You should do what Apple says, so looks like things have changed and you must use Apple Diagnostics : http://support.apple.com/kb/HT5781

(however, both AHT from Lion, and now Apple Diagnostics are launched by doing a "D" boot)

 

[jakeng]

I'll do the test and publish the results here.

 

[jakeng]

I've just run the test and no issues were found.

 

[Bruno09]

Good news.

If it were me, I would wipe the disk and reinstall.
(save all you data...)

Something is wrong in your system/setup/startupitems/extensions, etc....

 

[jakeng]

I think I should do that, though I'm not brave enough to do it myself.

 

[Bruno09]

It's very, very easy to do.

We can help you if you decide to take the plunge.

 

[jakeng]

OK, please tell me how I proceed.

 

[Bruno09]

Note : you will need to be connected to the Internet.
Check that your connexion is ok.

Save you iLife and iWork applications and your data to an external drive.

Restart the Mac, hold Cmd + r on chime.

It will boot up from the Recovery partition.

You will see this screen :



Select Disk Utility.

Select the “Macintosh HD” partition under the Macintosh HD disk.

Go to the "Erase" tab.

Erase the partition to Mac OS extended (journaled) format.

Now quit Disk Utility and click “Reinstall OS X” and wait for the ~5GB download (this will take a while…) and reinstall.

If something unclear, please ask before proceeding.

Also see : http://support.apple.com/kb/HT4718?viewlocale=en_US&locale=en_US

 

[jakeng]

Thanks, it seems straight-forward. I'll do it now.

 

[Bruno09]

What are the news ?

 

[jakeng]

I've done the reset and the performance has come to normal again, no errors anymore!

Thank you all!

PS: Hehe, excellent smiley icon!

 

[Bruno09]

Happy news, glad it's resolved.