Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 68)

Mac mini (Late 2009) Symptom Charts — Input/Output Devices 68 2009-11-03
Is the FireWire device 4.
recognized with a known good
FireWire cable on the user’s
computer?
Yes FireWire cable issue. Issue
resolved.
No FireWire device may need
additional power. Use a
powered FireWire hub. If the
issue persists, check for any
firmware updates for the
FireWire device. Go to step 5
Using a Powered FireWire 5.
hub, and having installed any
software or firmware update
for the device, is the FireWire
device recognized now?
Yes Device recognized. Required
additional power from hub or
update. Issue resolved.
No Device may require additional
software, or there may be a
conflict in the Mac OS. Test in
New User. Go to step 5
Is the FireWire device 6.
recognized with a New User?
Yes Software Issue. Troubleshoot
software on User account.
Issue resolved.
No Apply all Mac OS updates. If
the issue persists, replace the
FireWire device.