MacBook can't detect WiFi

Dear forum members,
I know that this problem is discussed in several other threads and also on other fora. However, the WiFi-problems vary in such a way that I cannot completely relate to them.
The problem:
My macbook cannot detect our own WiFi network. It can detect other WiFi networks.
The strange thing is: we have one Windows laptop, 2 Iphones and 1 Ipad which all 'see' and connect to our WiFi network.
Some specifications:
- In a desperate attempt to fix the problem I have erased the HD and did a fresh installation of Lion OS. The same problems still occurs. (please no discussion on whether a fresh install is necessary on Mac's)
- The laptop has been connecting to the same WiFi for almost a year without any problems.
- Nothing apparent has happened in our home network that I can think of.
- It concerns a macbook from 2008 with a fresh Lion OS installed on it.
- The WiFi network is WPA2 protected.
- The laptop is able to connect to our router by using a normal cable.
I am Dutch, so my apologies in advance for any grammar or spelling mistakes.
Edit: sometimes the WiFi is visible but when I try to connect, a time out error occurs.
Michel

I don't have any solution but you may get a better response on the wireless community.
https://discussions.apple.com/community/wireless

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