Apple MD094LL/A manual H04, If computer starts up, H03, Mac OS without errors

3.	With user’s permission, erase	Yes	Go to step 6.
	internal drive(s) containing Mac
	OS X, and reinstall it. Verify if	No	Go to step 4.
	installation process completes.
4.	Inspect internal drive(s) SATA	Yes	Replace damaged cable.	H04
	power and data cables and		Go to step 6.
	connectors for bent pins, or
		No	Go to step 5.
	other damage to the cable.
5.	Reseat SATA cable on internal	Yes	Go to step 6.
	drive(s) and logic board. Verify
		No	Replace internal drive(s) SATA	H04
	if computer starts up.
			data cable. Go to step 6.
6.	Reboot computer. Verify if	Yes	Issue resolved.
	system boots successfully and
	Disk Utility “Verify” function	No	Go to step 7.
	reports no errors.
7.	Test with known-good	Yes	Reinstall user’s drive, go to
	bootable drive. Verify if system		step 8.
	boots successfully and Disk
		No	SATA data cables verified or	M19
	Utility “Verify” function reports
			replaced and known-good
	no errors.
			drive installed used without
			success. Replace logic board.
8.	Reboot computer. Verify if	Yes	Issue resolved.
	system boots successfully and
		No	User’s drive appears to be
	that Disk Utility “Verify” function
			defective. Go to step 9.
	reports no errors.
9.	Replace user’s drive. Verify if	Yes	Issue resolved by replacing	H03
	drive formats correctly with a		user’s drive.
	GUID partition map and installs
		No	SATA data cable verified or	M19
	Mac OS without errors.
			replaced and new drive did
			not resolve issue. Replace
			logic board.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Mass Storage  73