Apple MD094LL/A manual Hard Drive Not Recognized, Symptoms Quick Check Drive Not Recognized

Mass Storage

Hard Drive Not Recognized

Unlikely cause: LCD panel, power supply, fans, speakers, camera, microphone

Quick Check

Symptoms	Quick Check
Drive Not Recognized	1.	Use a known-good mouse. A stuck mouse button
Drive No Boot		will not allow boot.
• Flashing Question Mark	2.	Boot from Install DVD. Use Disk Utility to verify
• Boots to Grey Screen
		S.M.A.R.T. status of internal drive(s).
• Boots to Blue Screen	3.	Use Disk Utility to repair Mac OS X on disk.
• Boots to Prohibitory Symbol
	4.	Verify that user’s data is backed up and that user
(Review kBase #HT2674: Intel-
		authorizes erasing disk and reinstalling software.
based Mac: Startup sequence
	5.	Use Target Disk Mode to mount user’s drive on a
and error codes, symbols)
		known-good computer. Use Disk Utility on host
		computer for Quick Checks 2 through 4.
	6.	Identify if system is shipped with one hard drive,
		or with a second SSD drive option (Mac OS X
		boot volume setup may differ in that case)

Deep Dive

Check		Result	Action	Code
1.	Boot from Install DVD and run	Yes	Go to step 2.
	Disk Utility. Verify if user’s drive
	is available for Disk Utility to	No	Go to step 5.
	repair.
2.	Run Disk Utility’s “Repair	Yes	Go to step 3.
	Disk” function and verify if it
		No	Go to step 4.
	completes successfully.
3.	Reboot computer. Verify if	Yes	Data error. Issue resolved.
	system boots successfully and
	that Disk Utility “Verify” function	No	Go to step 4.
	reports no errors.
4.	With user’s permission, erase	Yes	Go to step 8.
	internal drive and reinstall Mac
	OS. Verify if installation process	No	Go to step 5.
	completes.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Mass Storage  70