Security Update 2006-007 Special Report: Excessive iMac fan speed

Some users are reporting a marked increase in iMac (both G5 and Intel-based) fan activity after installing Security Update 2006-007.

MacFixIt reader Lawrence Orenstein writes: "Since downloading the security update fan on my G5 IMac has been running at an excessive speed."

In some cases, resetting an SMU or SMC (depending on the iMac model) can resolve this issue.

For G5-based iMacs, the SMU reset process is as follows:

1. Turn off the system
2. Unplug all cables, including power
3. Wait 10-30 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.

For Intel-based iMacs, the SMC reset process is as follows:

1. Turn the system off
2. Unplug all cables, including the power cord then wait 15 seconds
3. Plug the power cord back in (Apple notes that you should make sure the power button is not being pressed at the time of power cord connection) then reconnect other devices.
4. Turn the system back on.

Index:

• AirPort connectivity: Loss of
• Application launch delay
• Bluetooth: Loss of
• Excessive iMac fan speed
• Font Book: Inability to launch
• General fixes for common problems
• Getting the update off your Mac
• Login to secure sites fails
• Microsoft Office applications: Problems
• Palm synchronization dificulties
• Release notes, update recommendations
• Slow access to network drives
• Startup problems
• USB/FireWire device connectivity issues

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