-
All replies
-
Helpful answers
-
Nov 11, 2011 8:42 AM in response to waynefromburkeby kumareshwar,Reset PRAM and NVRAM.
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Reset SMC
1. Shut down the computer.
2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
4. Release all the keys and the power button at the same time.
5. Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.I hope its work...
-
Nov 11, 2011 2:09 PM in response to kumareshwarby waynefromburke,Thank you -
I wound up taking it in for service, where they told me the wifi card had died. Fortunately it was still under warranty.
-
Feb 20, 2012 6:50 AM in response to waynefromburkeby Y_NO,I too am having the same problem. I stumbled upon the following solution from a blog. It worked for me:
Just UNCHECK that "Re-open windows when logging back in" button when you log out or shut down and then restart.
http://macnerd-presents.blogspot.com/2011/08/os-x-lion-wifi-no-hardware-installe d.html