Apple MD094LL/A Manuale Utente

iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices 

 2010-09-09

Unlikely cause: LCD display, power supply, hard drive, optical drive, fans

FireWire Device Not Recognized
•  FireWire hard drive not 

recognized

•  FireWire optical drive not 

recognized

•  FireWire camera not recognized
•  FireWire printer not recognized

1.  For external FireWire drives, make sure any 

external power source is plugged in and 

operating to isolate a power issue with the 

device.

2.  Test a known-good FireWire device to isolate a 

failed peripheral issue.

3.  Test a known-good FireWire cable to isolate a 

FireWire cable issue.

4.  Ensure that all software and firmware updates for 

this model have been installed to take advantage 

of any available bug fixes.

5.  Launch Apple System Profiler and verify if the 

affected FireWire device is visible on FireWire 

bus. If yes, then FireWire port and cable are 

functioning properly. Contact FireWire device 

manufacturer to verify that device is supported.

1.  Unplug all FireWire devices 

from computer. Reset PRAM. 

Reconnect FireWire device 

in question. Verify if FireWire 

device is 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 (such as 

another Mac in Target Disk 

Mode). Verify if FireWire device 

is recognized.

Yes

Try FireWire device in question 

with a known-good computer 

of same model. Go to step 3.

No

FireWire not recognized. 

Replace logic board.

3.  Verify if FireWire device is 

recognized on a known-good 

same model computer.

Yes

Go to step 4.

No

Device may need additional 

power. Use a powered FireWire 

hub. Go to step 5.