My MBP's wifi is error! Please Help :(

According to the topic, I've been using This macbook pro(mid 2009 model) since 2009 with OS Mavericks 10.9.4(most recently). It hasn't had any problems until yesterday.
While I was using my mac with wifi network, it suddenly hanged and I cannot moved my cursor or restarted my mac right from screen. As the result, I decide to hold a power button until the screen was shut-downed. It was the only way to restart my mac.
Then I turned on my mac again and noticed that WIFI network showed me this
yes, I cannot use wifi network. and I've been searching on the internet by connect Ethernet instead for solving this problem but there're no any answer for me.
Please help, I have to continue my project outdoor and I need to repair my wifi hardware as soon as possible
Thank you so much
and sorry for my english.

In many cases, this issue is caused by a hardware fault. 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. Reset the NVRAM.
3. Reset the System Management Controller.
4. Start up in Recovery mode. In the menu bar of the OS X Utilities screen, there's a Wi-Fi menu. If it works, selectInstall 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. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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