Suddenly can't connect to wireless networks
I've got a MacBook Pro. I am having problems connecting to the internet wirelessly. My MacBook can see the wireless network, it shows a strong signal, and it connects to the network fine. But, it says it cannot connect to the internet. I know there is an active internet connection, and I know it's not protected, as these are public networks, and I connect to the internet fine with my other computer. It does this on EVERY wireless network except my home network, in which it connects to the internet fine. I just started having this problem recently; I noticed this problem after I used an ethernet cable at a hotel to connect to the internet. Now, for some reason, it doesn't like to connect wirelessly. Any ideas?
Answer
If you're able, try plugging in to an Ethernet cable and from the Apple Menu, select Software Update. If any updates are offered, go ahead and install them. If after the updates are complete, AND it's not offering any more updates try connecting again to the wireless network.
If you're still unable to connect to the wireless networks, you may need to remove the system settings for networking. These settings are stored in HARD DRIVE > Library > Preferences > System Configuration.
If you remove the files within that folder, you'll need to restart. Once restarted, you'd go into Apple Menu > System Preferences > Network and you'll see there are no network connections. You'll have to add Airport and any other ports that you might normally use and configure them.
It's also possible that you might simply need to repair disk permissions on your hard drive using Disk Utility which is located inside HARD DRIVE > Applications > Utilities