Apple MD094LL/A Manual De Usuario
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
• 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
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
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
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.