Apple MD094LL/A manual FireWire Device Not Recognized, For external FireWire drives, make sure any

FireWire Device Not Recognized

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

Quick Check

Symptoms	Quick Check
FireWire Device Not Recognized	1.	For external FireWire drives, make sure any
• FireWire hard drive not		external power source is plugged in and
recognized		operating to isolate a power issue with the
		device.
• FireWire optical drive not
	2.	Test a known-good FireWire device to isolate a
recognized
• FireWire camera not recognized		failed peripheral issue.

•FireWire printer not recognized 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.

Deep Dive

Check		Result	Action	Code
1.	Unplug all FireWire devices	Yes	Issue resolved.
	from computer. Reset PRAM.
	Reconnect FireWire device
		No	Possible logic board failure.
	in question. Verify if FireWire
			Go to step 2.
	device is recognized.
2.	Use a known-good FireWire	Yes	Try FireWire device in question
	cable with a known-good		with a known-good computer
	FireWire device (such as		of same model. Go to step 3.
	another Mac in Target Disk
		No	FireWire not recognized.	M12
	Mode). Verify if FireWire device
	is recognized.		Replace logic board.
3.	Verify if FireWire device is	Yes	Go to step 4.
	recognized on a known-good
		No	Device may need additional
	same model computer.
			power. Use a powered FireWire
			hub. Go to step 5.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices  102