Apple MD094LL/A Manuale Utente

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

 2010-09-09

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

Drive No Boot
•  Flashing Question Mark
•  Boots to Grey Screen
•  Boots to Blue Screen
•  Boots to Prohibitory Symbol 

(Review 

)

1.  Use a known-good mouse. A stuck mouse button 

will not allow boot.

2.  Boot from Install DVD. Use Disk Utility to verify 

S.M.A.R.T. status of internal drive(s).

3.  Use Disk Utility to repair Mac OS X on disk.
4.  Verify that user’s data is backed up and that user 

authorizes erasing disk and reinstalling software.

5.  Use Target Disk Mode to mount user’s drive on a 

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)

1.  Boot from Install DVD and run 

Disk Utility. Verify if user’s drive 

is available for Disk Utility to 

repair.

Yes

Go to step 2.

No

Go to step 5.

2.  Run Disk Utility’s “Repair 

Disk” function and verify if it 

completes successfully.

Yes

Go to step 3.

No

Go to step 4.

3.  Reboot computer. Verify if 

system boots successfully and 

that Disk Utility “Verify” function 

reports no errors.

Yes

Data error. Issue resolved. 

No

Go to step 4.

4.  With user’s permission, erase 

internal drive and reinstall Mac 

OS. Verify if installation process 

completes.

Yes

Go to step 8.

No

Go to step 5.