Apple MD094LL/A Manuale Utente

iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power 

 2010-09-09

3.  Use known-good SDRAM in the 

system. Verify if system start 

without kernel panic now.

Yes

Install user’s SDRAM one by 

one and retest. If kernel panic 

repeats, replace affected 

SDRAM. Verify if correct 

SDRAM specification is being 

used.

No

Go to step 4.

4.  Wait for 20 seconds after 

shutdown and disconnect 

AirPort cable on logic board. 

Verify if system starts without 

kernel panic now.

Yes

Go to 

 symptom flow.

No

Go to step 5.

5.  Disconnect SATA cable from 

hard drive and startup to the 

Install DVD in the optical drive 

or from an external volume. 

Verify if system starts without 

kernel panic now.

Yes

Go to 

 symptom flow.

No

Go to step 6.

6.  Disconnect camera and 

microphone cables from logic 

board. Verify if system starts 

without kernel panic now.

Yes

Go to 

 or 

 symptom 

flow as appropriate.

No

Go to step 7.

7.  Disconnect Bluetooth cable 

on logic board. Verify if system 

starts without kernel panic 

now.

Yes

Go to 

 symptom flow.

No

Go to step 8.

8.  Disconnect SD board on logic 

board. Verify if system starts 

without kernel panic now.

Yes

Go to 

 symptom flow.

No

Go to step 9.

9.  Disconnect optical drive and 

test. Verify if system starts 

without kernel panic now.

Yes

Go to 

 symptom flow.

No

Replace logic board.