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Mac mini (Late 2009) Symptom Charts — Input/Output Devices 69
2009-11-03
USB Devices Not Recognized
Quick Check
Symptoms Quick Check
USB Devices Not Recognized
USB wired keyboard/mouse not •
recognized
USB external drive not •
recognized
USB printer not recognized•
For printers and external USB drives, make sure 1.
any external power source is plugged in and
operating to isolate a power issue with the
device.
The system has 5 USB ports on the rear of the 2.
computer. Make sure to try each port to isolate a
particular port malfunction.
Test with a known good wired keyboard or 3.
mouse to isolate a failed peripheral issue.
Test with a known good USB cable when dealing 4.
with a printer or external USB drive, to isolate a
USB cable issue.
Ensure that all available Software Updates have 5.
been applied to the computer for access to the
latest bug xes.
Deep Dive
Check Result Action Code
Unplug all USB devices from 1.
the computer except for the
keyboard and mouse. Start
the computer and reset PRAM.
Are the keyboard and mouse
recognized?
Yes Test in all USB ports to ensure
all USB ports working as
expected. Replace logic board
for any port failures.
No Possible logic board failure.
Go to step 2
Did Bluetooth Mouse Setup 2.
assistant launch after startup?
Yes Bluetooth detected via
Internal USB, but external USB
devices not recognized. Go to
step 3
No Bluetooth not recognized
via internal USB. Disconnect
mouse and keyboard. Go to
step 4