My mac mini (2013) dose not show me wifi connection.

my wifi sign on my mac mini 2013 OS X 10.8.5 (12F37).
it started before my last update and hasnt been resolved after getting OS X 10.8.5
it shows on the WIFI sign WI FI: NO HARDWARE INSTALLED.
can you help me?

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. Reset the NVRAM.
3. Reset the System Management Controller.
4. Boot into Recovery. In the menu bar of the OS X Utilities screen, there's a Wi-Fi menu. 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.
5. Take the machine to an authorized service center for testing.

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