Wifi problems seem to crop up a lot on here and unfortunately there doesn't seem to be a 'one fix' solution.
However, sometimes any one of the following can help although, unfortunately, not always - in no particular order:
- Check wifi security - if it's WEP change it to WPA or WPA2 (preferably, as it's more secure)
- Change the wifi channel on the router
- Create a new Network Location: http://support.apple.com/kb/HT5289
- Reboot the router
Also take a look at this link and the links within the article for other ideas. They mainly reference Lion, but still seem to be relevant to Mountain Lion:
...and this link:
I bought 5 months ago a Mac Pro in The Netherlands. OS Mountain Lion 10.8.3. and updated. For the last 4 months I traveled With it in Southeast Asia without any problems
Anyway, last week I arrived in Perth - Australia and sinds that moment it is hard to get wi-fi connection. Which is killing me. In 90 % of the times there is no possibility to internet. And there are always 3 choices:
- Connection, but the wifi symbol has an ''exclamation mark''
- Or it is directly saying ''unable to connect''
- Or it is connected, but nothing happens
Thus far there are 3 point where I had the possibility to connect. One of them was a Apple Store (logic). In more then 90 percent of all the other cases, there was no connection.
At this moment I already went 2 times to the Apple store, but they are saying that because my laptop is everything is alright with my laptop, it is a router problem. For me that is hard to take. That means that everybody that buys a Mac Pro must have the same problem around here.
I asked some other people (travelers) with a Mac and iPhone, but they are not complaning. Thus no problem with the connection.
Anybody that can help me or have an idea?
Well it is certainly not Perth. WiFi is very strong here. It will be within your network settings.
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