iMac (27-inch, Mid 2010) Symptom Charts — Display 62
2010-09-09
Distorted/Blurred Image
Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone
Quick Check
Symptoms Quick Check
Distorted/Blurred Image
• Text and graphics appear fuzzy
• Image corrupted
1. If display icker only occurs when the brightness
level is set below maximum, then jump to topic,
“Display: Backlight Issue / No Backlight.”
2. Run Automatic Software Update to verify that all
available rmware 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.
Deep Dive
Check Result Action Code
1. Verify if user issue is due to
ickering, or to an unstable
video image on the LCD.
Yes Flickering issue, go to Noise /
Unstable Flickering.
No Go to step 2. All other issues
go to appropriate symptom
ow.
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 rmware
updates have been installed.