Apple MC408LL Apple Technician Guide - Page 72

Apply all Mac OS updates. If, Mac in FireWire Target Disk

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2010-08-03 Deep Dive Check 1. Unplug all FireWire devices from the computer. Start the computer and reset PRAM. Reconnect the FireWire device in question. Is the FireWire device recognized? 2. Use a known good FireWire cable with a known good FireWire device (another Mac in FireWire Target Disk mode is good). Is this device recognized? 3. Is the FireWire device recognized on a known good computer of the same make and model? 4. Is the FireWire device recognized with a known good FireWire cable on the user's computer? 5. Using a Powered FireWire hub, and having installed any software or firmware update for the device, is the FireWire device recognized now? 6. Is the FireWire device recognized with a New User? Result Yes No Action Issue resolved Possible logic board failure. Go to step 2 Yes Try the FireWire device in question with a known good computer of the same make and model. Go to step 3 No FireWire not recognized. Replace main logic board. Yes Test the FireWire device with a known good cable on user's computer. Go to step 4 No FireWire device may need additional power. Use a powered FireWire hub. Go to step 5 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 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 Yes Software Issue. Troubleshoot software on User account. Issue resolved. No Apply all Mac OS updates. If the issue persists, replace the FireWire device. Code M12 Mac mini (Mid 2010) Symptom Charts - Input/Output Devices 72

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Mac mini (Mid 2010) Symptom Charts — Input/Output Devices
72
2010-08-03
Deep Dive
Check
Result
Action
Code
1.
Unplug all FireWire devices
from the computer. Start the
computer and reset PRAM.
Reconnect the FireWire device
in question. Is the FireWire
device recognized?
Yes
Issue resolved
No
Possible logic board failure.
Go to step 2
2.
Use a known good FireWire
cable with a known good
FireWire device (another
Mac in FireWire Target Disk
mode is good). Is this device
recognized?
Yes
Try the FireWire device in
question with a known good
computer of the same make
and model. Go to step 3
No
FireWire not recognized.
Replace main logic board.
M12
3.
Is the FireWire device
recognized on a known good
computer of the same make
and model?
Yes
Test the FireWire device with
a known good cable on user’s
computer. Go to step 4
No
FireWire device may need
additional power. Use a
powered FireWire hub. Go to
step 5
4.
Is the FireWire device
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
5.
Using a Powered FireWire
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
6.
Is the FireWire device
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.