Apple 17-INCH LATE 2006 CD Manuale Utente

iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 

The System Management Controller (SMC) is a chip on the logic board that controls all power 
functions for your computer. If your computer is experiencing any power issue, resetting the SMC 
may resolve it. The SMC controls several functions, including:

Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth.
Handling system resets from various commands.
Controlling the fans.

Note that resetting the SMC does not reset the PRAM. Resetting the SMC will not resolve issues 
in which your computer is unresponsive—in these situations, restarting your computer will 
generally suffice. If your computer isn’t responding, perform these steps one at a time, in this 
order, until the issue has been resolved:

Force Quit (Option-Command-Escape).

Restart (Control-Command-Power).

Force Shut Down (press the power button for 10 seconds).

Resetting the SMC can resolve some computer issues such as not starting up, not displaying 
video, sleep issues, fan noise issues, and so forth. If your computer still exhibits these types of 
issues after you’ve restarted the computer, try resetting the SMC.

To reset the SMC on an iMac

From the Apple menu, choose Shut Down (or if the computer is not responding, hold the 
power button until it turns off).

Unplug all cables from the computer, including the power cord.

Wait at least 15 seconds.

Plug the power cord back in, making sure the power button is not being pressed at the time. 

Reconnect your keyboard and mouse to the computer.

Press the power button on the back to start up your computer.

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