Apple MD094LL/A Symptoms Quick Check Fan Failures / Thermal Issues, System feels very hot

Fan Failures / Thermal Issues

Unlikely cause: speakers

Quick Check

Symptoms		Quick Check
Fan Failures / Thermal Issues		1.	Verify that vents on bottom and back of system
• System feels very hot			are free of dust and other obstructions that might
•	Fan(s) not operating		inhibit proper airflow through the system.
•	Fan(s) running fast	2.	Verify that computer is not exposed to direct
•	System is noisy		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.

Deep Dive

Check	Result	Action	Code
1. Run latest available Apple	Yes	Suspect possible fan or
service utilities and. Verify if one		sensor error. Go to ASD Error
or more errors are reported.		Codes table and sensors
		location table (in General
		Troubleshooting) to decode
		error. Follow instructions in
		table for resolving error, then
		retest.
	No	Go to step 2.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Mechanical  121