Apple MD094LL/A Check that the 4 wire Sata Yes Replace any damaged Sata, Power cable carrying 12v

5.	Check that the 4 wire SATA	Yes	Replace any damaged SATA	X03
	power cable (carrying 12v and		Bus or SATA Power cable. For
	5v DC) is correctly connected		the internal SATA drive(s), the
	to the Hard Drive (other SATA		DC power comes from the
	power connector has less wires		main DC power cable harness.
	and is reserved for 5v DC only,		Go to step 8.
	optional SSD drive). Inspect
		No	Go to step 6.
	internal drive(s) SATA and
	power cables and connectors
	for bent pins, or other damage
	to the cable(s).
6.	Reseat internal drive(s) SATA	Yes	Go to step 8.
	data cable(s) at logic board
		No	Replace boot drive SATA	X03
	and drive ends, and verify if
	computer boots up successfully.		cable. Go to step 8.
7.	Test with a known-good	Yes	Reinstall user’s drive.
	bootable drive. Verify if system		Go to step 9.
	boots successfully and that Disk
		No	SATA data cable was verified
	Utility “Verify” function reports
			or replaced, and known-good
	no errors.
			drive is installed:
			-If hard drive does not spin up
			when system is powered on,
			replace DC power harness; if	X03
			the no spinning issue persists
			after DC cable was replaced,
			replace Power Supply.	P99
			-If hard drive spin up sound
			can be heard when system
			is powered on, but system
			cannot boot from it , replace	M19
			logic board.
8.	Reboot computer. Verify if	Yes	Issue resolved. Return system
	system boots successfully and		to user.
	that Disk Utility “Verify” function
		No	Go to step 7.
	reports no errors.
9.	Reboot computer. Verify if	Yes	Issue resolved.
	system boots successfully and
		No	User’s hard drive appears to
	that Disk Utility “Verify” function
	reports no errors.		be defective. Go to step 10.
10. Replace affected internal drive.		Yes	Issue resolved by replacing	H01
	Boot from system-specific		affected internal drive.
	Install DVD and reinstall Mac
		No	SATA data cable verified/
	OS X with drive format option.
			replaced and new drive
	Verify if drive is formatted
			installed, Check with known-
	correctly (GUID partition table)
			good restore DVD. If restore
	and that software restore was
			failure still happens, go to
	successful.
			step 11.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Mass Storage  71