System information

Mac mini (Mid 2011) Symptom Charts — Input/Output Devices 77
2011-07-21
3. System Information >
Thunderbolt device tree should
display cable connections from
user’s computer to known-
good iMac. Is the Port Status
“Connected” and Link Status
at “2”?
Yes Go to step 9.
No Go to step 4.
4. Disconnect all connections
to Thunderbolt port on user’s
computer. Check for and
apply the latest software
and rmware updates. Verify
in System Information that
Thunderbolt hardware is
present, listing a unique UID
number and latest revisions
for controller and port micro
rmware.
Yes Go to step 5.
No Replace logic board. M33
5. Inspect both connector ends
of Thunderbolt cable for
cable/connector damage,
then inspect wire for cuts,
pulled strain relief or broken
connector housing. Has
Thunderbolt cable sustained
any damage that would aect
connectivity?
Yes Replace Thunderbolt cable. X26
No Go to step 6.
6. Inspect Thunderbolt port on
user’s computer for physical
damage or possible burn
mark indicators suggesting
a defective port. Does
Thunderbolt port appear to be
damaged?
Yes Replace logic board. M24
No Go to step 7.
7. Check Thunderbolt cable
connector alignment with port
opening. Can the Thunderbolt
cable be inserted into the port
fully without interference or
excessive force to seat it fully?
Yes Go to step 8.
No Logic board misaligned with
port opening in rear housing.
If Thunderbolt port shows
signs of damage which make
proper alignment impossible,
replace logic board.
M24