You bring your Mac PC back from the sleep and check the Wi-Fi but it isn’t working, so you do a reboot, but still you are experiencing the error saying ‘Wi-Fi: No hardware installed’, now what to do?  Yes, we understand this is quite annoying. Well, don’t worry because luckily this problem is very easy to solve.

Essentially what has happened is that the MacBook lost track of which devices are supposed to be powered on and which are supposed to be powered off, and it just left your Wi-Fi completely turned off even though the rest of the computer is on.

firstsly, its imporant to understand why your Mac is behaving this way? Your MacBook sometimes loses the track of the devices that are turned on and the devices that are powered off, therefore it leaves your Wi-Fi turned off completely even though your PC is on.

It’s somewhat like you woke up but your arm is sleeping because you just slept funny. So your entire body is all set to go, but your arm wants to rest.

Luckily fixing this issue is very simple, you just have to reset its System Management Controller (SMC) by pressing some keys, thats it.

Read more: Quick 10 Ways for Speeding Up your Slow Mac

What is a System Management Controller?

A SMC in your Mac is actually a subsystem that helps in controlling power management,video switching, battery charging, sleep/wake mode,keyboard backlighting, LED indicators and many other stuff.

As soon as your Mac goes in or out of the sleep mode, a SMC will start controlling what devices should be powered down for saving battery.Here is the actual problem because then the SMC receives wrong signals and believes that the Wi-Fi should remain off even if the computer starts.

Reset the System Management Controller and (Fix the Wi-Fi Error)

If you are using some device without a removable battery, Apple has been making most of its devices pretty much same since long time, you will have to close all your apps and use a key combination.

For latest MacBook without its Removable Battery

1.  Firstly you will have to plug your laptop into some power source
2.  Then press hold, these keys altogether: Control + Shift + Option + Power
3. After that release these keys
4. Lastly, turn it on by pressing on the power button.

Finally, this method should fix this problem — for us, it definitely solved the issue

For older MacBook having a Removable Battery

In case you have an older MacBook with a removable battery, then you will have to use a little different technique for resetting the SMC.

1. Start with unpluging the laptop
2. Then remove its battery
3. After that press hold its power button at least for 5 to 6 seconds
4. Insert back the battery and turn it on

iMac, Mac Mini or Pro

On the other hand, if you have an Apple desktop, you will have to follow a very simple and easy method.

1. Turn off the computer and unplug it
2. Now wait for at least 15 seconds (or a little bit more)
3. Plug back in , turn the computer on

After doing these steps we are sure that your problem should get solved, and you will not get the error again. Hopefully in some time only you will continue doing your work where you left it.