Apple MD094LL/A Manuale Utente

iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power 

 2010-09-09

Kernel Panic, System Crashes
•  Kernel Panic on startup or 

desktop use.

•  System freeze during use.
•  System freeze upon wake from 

sleep.

1.  Isolate OS by starting up from original install 

media for this computer, from a same model 

computer in Target Disk Mode, or from a 

compatible known-good OS on an external drive. 

Both AirPort and Bluetooth services are available 

when booted from the Install disk.

2.  Ensure that all software and firmware updates for 

this model have been installed to take advantage 

of any available bug fixes.

3.  Reset SMC and PRAM to clear any stored, 

corrupted information.

4.  Start up in Safe Mode by holding shift key down 

during startup to load only required kernel 

extensions and disable all startup and login 

items. See 

5.  Check the panic.log, located /Library/Logs/

Panicreporter, for information in the back trace 

that may give clues about the kernel panic.

6.  For more information, see 

1.  Boot the computer to Apple 

Hardware Test on internal hard 

drive or an inserted Install DVD 

by holding down the D key at 

startup. Verify if system boots 

up from any of these volumes.

Yes

Run extended tests and 

proceed with results. If AHT 

passes or boots with a kernel 

panic, go to step 2.

No

Go to step 2.

2.  Remove all peripheral devices 

including keyboard and mouse. 

Verify if system starts without 

kernel panic.

Yes

Add peripheral devices one 

at a time until kernel panic 

repeats. Replace device 

causing issue.

No

Go to step 3.