Press and hold down on the Mac power button for about 5 seconds.Shut down the Mac and disconnect it’s power cable.If the wi-fi works, join wifi as usual and you’re good to go. Connect the battery again and boot up as usual.Disconnect the power cable, then hold the Power button for about 5 seconds, then release the button.Shut down the MacBook and take out the battery.If you can take out the battery on the MacBook yourself, then resetting SMC is a bit different: SMC: For older MacBook models with removable batteries When the Mac boots up you should no longer see the “X” in the wi-fi icon and wi-fi should work as usual on the Mac. Hold Shift + Control + Option + Power buttons concurrently for about five seconds, then release all keys together.Connect the MacBook to the MagSafe power cable and an outlet so it is charging.If you have any newer model MacBook with a non-removable battery (basically anything post-2010 model year), this is how you reset the SMC: SMC: For newer MacBook, MacBook Pro models with internal batteries If you still have problems and still see that error message, you’ll want to continue on with resetting the SMC which we’ll cover next. Is it working? Is the wi-fi menu no longer showing the “X” and “No hardware installed” error message? Is it looking for networks? Then you’re good to go. When the Mac boots back up, pulldown the wi-fi menu again. Continue holding all Command+Option+P+R keys until you hear the Mac reboot sound again, then release all keys concurrently.Reboot the Mac and immediately hold down Command + Option + P + R keys together.NVRAM: For all Mac models with Wi-Fi No Hardware Installed Error Since resetting SMC is slightly different on each Mac, first we’ll cover resetting the NVRAM which is the same on every Mac model. This two-part troubleshooting method works on every Mac and every version of Mac OS X, so it doesn’t matter which model or OS version you are experiencing trouble with. ![]() The trick to resolving the wi-fi hardware not installed error is usually two parts you’ll reset the SMC and reset the NVRAM as well on whatever Mac that is displaying the problem message in the wireless menu. The 2 Step Solution: NVRAM & SMC Resetting ![]() It can happen on any MacBook, MacBook Pro, Air, iMac, Mac Mini, Mac Pro, and virtually any other hardware, though MacBook users are usually the first to notice it given the propensity for wireless networking usage with Mac laptops. Typically if you experience this problem, you’ll see the ‘Wi-Fi: No hardware installed’ message after waking a Mac from sleep, rebooting the Mac, or sometimes after installing a system software update.
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