Apple MD094LL/A Manuale Utente

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

 2010-09-09

Unlikely cause:  speakers

Fan Failures / Thermal Issues
•  System feels very hot
•  Fan(s) not operating
•  Fan(s) running fast
•  System is noisy

1.  Verify that vents on bottom and back of system 

are free of dust and other obstructions that might 

inhibit proper airflow through the system. 

2.  Verify that computer is not exposed to direct 

sunlight which may heat up enclosure, making it 

feel hot to the touch.

3.  Verify computer is not running hotter than 

expected for normal operation. If possible, 

compare to a similarly configured system. Note: 

Power supply is located in upper left corner 

where highest temperatures can usually be felt.

4.  Launch Applications/Utilities/Activity Monitor. 

Verify if an application or process is consuming 

a high percentage of CPU bandwidth. CPU-

intensive applications can cause fans to run 

fast in order to maintain proper internal system 

temperatures. If needed, quit the application or 

restart the system to resolve issue.

5.  Reset SMC by unplugging power cord for ~15 

seconds. 

6.  Run latest available Apple service utilities.

1.  Run latest available Apple 

service utilities and. Verify if one 

or more errors are reported.

Yes

Suspect possible fan or 

sensor error. Go to ASD Error 

 (in General 

Troubleshooting) to decode 

error. Follow instructions in 

table for resolving error, then 

retest.

No

Go to step 2.