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I have a Macbook 1.83ghz.

I installed Snow Leopard and the WiFi crashed (?)

It was barely functioning before, but now all it can do is detect names of routers.

I haven't done anything as I don't know what to do.

How do i run a diagnostic before I have to buy a new WiFi card?

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We need to work with you to clarify the question. You wifi card is working as far as detecting the networks. – Buscar웃 Aug 13 '13 at 18:16

Lets do some information collecting then do some testing.

Click on the Apple (top left)

About this Mac

More Info

System Report

Now look for Network and WiFi

There you will see the information about your WiFi card and the status of the connections.

It looks like this: enter image description here

As next step I suggest to do some Diagnostics.

Than open the Network Diagnostics to test your WiFi connection.

Choose Apple menu > System Preferences, and then click Network.

Click “Assist me,” click Diagnostics, and then follow the onscreen instructions.

This test will tell you about your WiFi card and connections.

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Usually, this kind of problem occurs in Windows but I have noticed it on Mac where both possibilities(software or hardware) exists. The first step is to boot the system from an osx dvd and see if the wifi signal is there. If yes then it's a software problem if not then it's the card itself.

Thanks Tech from computer and Mac repair

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