Справочник Пользователя для Apple MD094LL/A

iMac (27-inch, Mid 2010) Symptom Charts — Display 

 2010-09-09

Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone

Distorted/Blurred Image
•  Text and graphics appear fuzzy
•  Image corrupted

1.  If display flicker only occurs when the brightness 

level is set below maximum, then jump to topic, 

“

2.  Run Automatic Software Update to verify that all 

available firmware and software updates have 

been applied.

3.  Verify Mac OS X version installed is the build 

version supported on the hardware.  Make sure 

customer didn’t migrate over old version of Mac 

OS X.

4.  Set System Preferences > Displays to native 

resolution of LCD. Non-native resolutions are 

unable to produce optimal clarity.

5.  Clean outside of glass panel.
6.  Boot from install DVD to determine if a potential 

software issue exists.

1.  Verify if user issue is due to 

flickering, or to an unstable 

video image on the LCD.

Yes

Flickering issue, go to 

No

Go to step 2. All other issues 

go to appropriate symptom 

flow.

2.  Boot from Install DVD and 

verify if issue is still visible.

Yes

Go to step 3.

No

Verify Mac OS X version 
installed is the build version 
supported on the hardware.  
Make sure customer didn’t 
migrate over old version 
of Mac OS X. Make sure 

all software and firmware 

updates have been installed.