System information

Mac mini (Mid 2011) Symptom Charts — Input/Output Devices 72
2011-07-21
Thunderbolt Not Recognized
Unlikely cause: LCD panel, internal drive(s), fan
Quick Check
Symptoms Quick Check
Thunderbolt Not Recognized
• Thunderbolt hardware not
listed in System Information
device tree.
1. Check Apple Technical article HT1159: Mac OS
X versions (builds) included with Intel-based
Macs to make sure system build is correct for this
computer model.
2. Check for and apply the latest software and
rmware updates.
3. Verify in System Information device tree that
Thunderbolt hardware is present.
Deep Dive
Check Result Action Code
1. Check Apple Technical article
HT1159: Mac OS X versions
(builds) included with Intel-
based Macs to make sure
system build is correct for this
computer model. Is Mac OS
X version equal to or a newer
than a version that will support
Thunderbolt functionality?
Yes Go to step 2.
No Start up from known-good
original system media or an
up-to-date, bootable OS X
volume and restore with latest
version of OS X.
Go to step 2.
2. Check for and apply the
latest software and rmware
updates. Verify in System
Information device tree that
Thunderbolt hardware is
present, listing a unique UID
number and latest revisions
for controller and port micro
rmware.
Yes Issue resolved.
No Go to step 3.
3. Reset PRAM by holding down
Command-Option-P-R keys
while rebooting, until you
hear the startup sound for the
second time. Verify in System
Information device tree that
Thunderbolt hardware is
present.
Yes Issue resolved.
No Replace logic board. M33