Macbook can't connect to wireless internet

I have had this strange issue with campus wireless access several times that my iMac or Macbook Air can't connect to the internet, but a Windows machine or my smartphone would connect just fine. The solution that worked for me was going into the Library folder and deleting the SystemsConfiguration folder.

Steps

1. Go into your hard disk folder, which is usually Macintosh HD.
2. Then in your hard disk, go into the Library folder and then into the Preferences folder.
3. Delete the SystemConfiguration folder in there.
4. Reboot

After rebooting it finally connects to the wireless internet, and the SystemConfiguration folder is also recreated, so you don't need to worry about that.

Questions and Comments

Q: How do I open the hard disk folder?

A: If you don't know how to open the hard disk folder, a way to let it appear on the desktop is: Open Finder, go to Preferences, select the "General" tab, and where it says "Show these items on the desktop" check next to "Hard Disks".

Q: Is it safe to delete the whole SystemConfiguration folder?

A: If you're worried you're deleting important other configuration files when you are deleting the SystemConfiguration folder, you could look inside and only delete the network related files. However, I didn't have any issues and the folder will just recreate itself.

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Let me know what you think of this article and where you see room for improvement. I only just started this blog, so feedback of any kind is appreciated!