Apple MD094LL/A Manuale Utente

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

 2010-09-09

11.  If restore from Install DVD is 

unsuccessful, startup a known-

good Intel Mac system with 

T key pressed (to enter Target 

Disk Mode), insert the iMac 

Install DVD in its optical drive 

and connect it to the user’s 

system via a FireWire cable. 

Startup user’s system while 

holding Option key, then select 

and boot from the Install 

Disc DVD and restore system 

software. Verify if software 

restore was successful.

Yes

Restore failure seems to be 

due to customer’s internal 

optical drive or media issue. 

Go to 

 symptom flow.

No

Restore failure seems to be 

due to internal SATA bus 

issue. Replace logic board.

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

Drive Formatting Issues
•  Cannot save documents
•  Read/write error message
•  Hang when accessing or saving 

data

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

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

2.  Use Disk Utility to repair disk.(s)
3.  Verify that user’s data is backed up and that user 

authorizes erasing disk and reinstalling software.

4.  Use Target Disk Mode to mount user’s drive(s) on 

a known-good computer. Use Disk Utility on host 

computer for Quick Checks 2 through 3.

1.  Run Disk Utility ‘Repair Disk’ 

function, and verify if it 

completes successfully.

Yes

Go to step 2.

No

Go to step 3.

2.  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 3.