Today when I started up my laptop the time was set back before 1 Jan. 2008 and my Wifi connection couldn't be restored. The best way to deal with this is to reset the System Management Controller (SMC). For my Macbook Pro I have to follow the following steps:
- Shut down the computer.
- Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
- On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- Press the power button to turn on the computer. Note: The LED on the MagSafe power adapter does not change states or temporarily turn-off when you reset the SMC.
