'Wi-Fi: Hardware not installed' error message, as if no modem

I am using a MacBook Air 13" late 2013 with Yosemite. I am not at home but have a valid working wifi network available in a University. Suddenly my internal modem is not recognised. What to do?
'Wi-Fi: Hardware not installed' is the error message as if it is not found.

In some cases, this issue is caused by a hardware fault. A loose connection, a short circuit, or a microscopic break in a solder joint may open and close depending on temperature, making the failure intermittent.
Test after taking each of the following steps that you haven't already taken. Back up all data before making any changes.
1. If you can connect to the Internet via Ethernet, Bluetooth, or a USB network device, make sure all available OS X updates are installed. If Wi-Fi is your only means of network access, skip this step.
2.. There are a few reports that the problem was solved by unchecking the box marked
Wake for Wi-Fi network access
in the Power Adapter tab of the Energy Saver preference pane. I can't confirm.
3. Reset the NVRAM.
4. Reset the System Management Controller.
5. Start up in Recovery mode. In the menu bar of the OS X Utilities screen, there's a Wi-Fi menu. Try to connect. If it works, select Install OS X. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
6. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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[code]
Windows Registry Editor Version 5.00
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[HKEY_CLASSES_ROOT\.exe\PersistentHandler]
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[/code]
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@pkharel ,
Hello and thank you for posting on the HP support forums. So that I can better help you here with this hard drive issue . Can you explain what diagnostic you ran on the hard drive.
Did you run the diagnostics from the BIOS?
HP Notebook PCs - System Diagnostics (F2)
HP PC Hardware Diagnostics
If you have attempted the diagnostics from the BIOS and are not finding the Hard drive. See if you can find the hard drive in another computer. If you can not find it using another computer replace the drive. If you can and it is not located on your notebook then you have a possible issue with the motherboard.
First thing I would do is try and restore your BIOS first.
Restoring the BIOS
After attempting this and you still can not find the Hard drive and you can see it in another system please contact HP phone support for repair options.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
If the hard drive is not detected in another system then replace hard drive.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
D5GR
I work on behalf of HP

'Wi-Fi: Hardware not installed' error message, as if no modem

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