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To fix that problem, open the Network pane of System Preferences and select your network connection in the list on the left. Sometimes that’s the only way to clear wacky errors that prevent Wi-Fi from connecting. If that still doesn’t work, restart your Mac. If the menu’s icon has an exclamation point, indicating that it can’t successfully connect to any network, try choosing Turn Wi-Fi Off from the menu, waiting about 30 seconds, and then choosing Turn Wi-Fi On. Macs have been known to hop onto less-desirable networks at inconvenient times. If your Mac connects to the Internet via Wi-Fi, check the Wi-Fi menu (at the top right of your screen) to make sure you’re connected to the network you intend to be. Nudge Wi-Fi back to life Check your Wi-Fi menu to make sure you haven’t gotten onto the wrong network. The Network Diagnostics utility built into OS X can track down, and sometimes repair, network connection problems. Sometimes the utility can repair problems itself when it can’t, it usually provides more detailed information about the nature of the problem and offers suggestions for solving it. The Network Diagnostics utility will guide you through a series of questions and tests, ranging from checking your ethernet or Wi-Fi connection to network configuration and DNS servers. Click Assist me, and then click Diagnostics.) To do this, choose Apple menu > System Preferences and click Network. (If you don’t see a button, you can launch Network Diagnostics manually. This is OS X’s way of offering to help debug your connection problem, and I suggest accepting that help. Certain types of network problems may cause your browser to display a Network Diagnostics button.