Apple MD094LL/A manual H06, Hard drive, Go to Fan Failures/Thermal

6.	Remove hard drive and verify	Yes	Go to step 7
	if rubber vibration isolation
		No	If grommets are missing or
	grommets are properly
			damaged, replace hard drive
	installed in hard drive bracket
			bracket or mechanism as
	(attached to hard drive) and
			appropriate. Go to step 7
	to mechanism in rear housing
	(where hard drive pins insert).
7.	Restart system and verify if the	Yes	Go to step 8
	noise is still present.
		No	Reseating or replacing the
			drive rubber grommets /
			bracket solved noise issue.
8.	Reconnect user’s drive and,	Yes	Go to step 9.
	with user’s permission, erase
		No	Replace hard drive.
	hard drive and reinstall Mac
			Go to step 10.
	OS. Verify if installation process
	completes.
9.	Restart system and verify if the	Yes	Replace hard drive.
	noise is still present.		Go to step 10.
		No	Software related issue.
10.	With replacement hard drive	Yes	Replacement hard drive did
	installed, reboot computer.		not resolve issue. Go to step
	Verify if noise is still present.		11 to check for other source
			of noise.
		No	Issue resolved by replacing	H06
			hard drive.
11.	Disconnect hard drive SATA and	Yes	Go to Fan Failures/Thermal
	power connections then boot		Issues symptom flow.
	from the Install DVD. Verify if
		No	Go to step 12.
	noise is caused by fans.
12.	Disconnect hard drive and	Yes	Possible optical drive or
	optical drive then boot from an		media issue. Go to Optical
	external volume. Verify if noise		Drive Noisy symptom flow.
	disappears when optical drive
		No	Noise issue still present, but
	has been disconnected.
			does not appear to be caused
			by hard drive. Go to Noise/
			Hum/Vibration symptom
			flow.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Mass Storage  75