Справочник Пользователя для Apple MD094LL/A

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

 2010-09-09

Intermittent Shutdown
•  Powers off during startup.
•  Powers off during desktop use.
•  Computer restarts 

spontaneously.

•  Powers off when waking from 

sleep.

1.  Make sure that power cord is securely attached 

to the back of computer, and is not hindered by a 

desk or other furniture.

2.  Plug computer directly into an AC outlet to test if 

a surge protector or UPS is causing issue.

3.  Open System Preferences > Energy Saver > 

Schedule and make sure that a “Shut Down” 

event is not scheduled.

4.  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.

5.  Reset SMC and PRAM to clear any stored, 

corrupted information.

6.  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