iMac (27-inch, Mid 2010) Symptom Charts — Display 60
2010-09-09
Incorrect/Missing Colors
Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone
Quick Check
Symptoms Quick Check
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
congured to use default display prole.
3. Verify System Preferences > Universal Access >
Display “Enhance contrast”, “Use grayscale”, and
“Black on White/White on Black” settings are set
to defaults.
Deep Dive
Check Result Action Code
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.
L14
3. Go to System Preferences >
Desktop & Screen Saver >
Desktop and set color to Solid
Gray Light. Verify if incorrect/
missing color issue aects
entire display.
Yes Suspect poor video
connection. Replace internal
DisplayPort cable between
logic board and LCD panel.
L14
No Go to step 4.