Apple MD094LL/A Manuale Utente

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

 2010-09-09

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

Incorrect/Missing Colors
•  Wrong color display
•  Color/contrast issues

1.  Allow display to reach normal operating 

temperature for about a minute before 

evaluating front-of-screen performance.

2.  Verify if System Preferences > Display settings are 

configured to use default display profile.

3.  Verify System Preferences > Universal Access > 

Display “Enhance contrast”, “Use grayscale”, and 

“Black on White/White on Black” settings are set 

to defaults.

1.  Verify computer has been 

warmed up for about a minute 

to stabilize backlight before 

continuing.

Yes

Go to step 2.

No

Warm up computer for about 

a minute. Go to step 2.

2.  Verify if all four cables on back 

of LCD panel are secure at both 

ends.

Yes

Go to step 3.

No

Reseat connections, replace 

damaged cable(s) if needed. 

Retest.

3.  Go to System Preferences > 

Desktop & Screen Saver > 

Desktop and set color to Solid 

Gray Light. Verify if incorrect/

missing color issue affects 

entire display.

Yes

Suspect poor video 

connection. Replace internal 

DisplayPort cable between 

logic board and LCD panel.

No

Go to step 4.