Apple Mac mini (Mid 2011 Technical Information Seite 35

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Mac mini (Mid 2011) Symptom Charts — Startup and Power 35
2011-07-21
Corrupted Video
Unlikely cause: Adapter, hard drive, fan, or speaker.
Quick Check
Symptoms Quick Check
Corrupted Video
Text and graphics appear fuzzy
Image corrupted
1. Set System Preferences/Display to a native
resolution. Non-native resolutions are unable to
produce optimal clarity.
2. Make sure all relevant software updates have
been applied. Graphics driver updates may be
included with software updates.
3. When the issue occurs take a screenshot of the
display (Command-Shift-3). View the screen shot
le on another known-good computer. If the
image corruption can be seen in the screenshot
then the issue is with the video drivers, software,
or video/logic board. If the issue cannot be seen
in the screenshot then the display and cable
should be tested further.
4. Isolate OS by starting up from known-good
original system media or an up-to-date, bootable
OS X volume like :
-the same Mac mini model connected and setup
in Target Disk Mode,
-a compatible known-good up-to date Mac OS X
installed on an external drive,
-by pressing the Cmd-R keyboard keys while
restarting, to access the Mac OS X Utilities
available from Recovery HD.
Note: The computer may need to be connected
to a network with Internet access.
5. Verify if issue can be reproduced on both
DisplayPort and HDMI ports.
6. Go to Deep Dive.
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