IMac unable to connect to secured network after 3 years

My iMac appears to be unable to connect to my wireless network even though nothing has changed. Error message reads ' could not join "XXXX" a connection timeout ocurred.
I connected to my new router with no issue and have been for other a month. Had no issue connecting to previous routers.
This afternoon, my iMac prompted me to join a network. I reset my router as this commonly solves most issues however in this instance no joy.
My Sony blu ray connects without issue (wired) my iPhone and iPad also connect (wirelessly)
I have reset my iMac aswell as shut it down and turned it on from cold, no luck. I have also tried to connect to my iPhone's hotspots functionality with no joy.
I am able to join the unsecured 'btcloud' network with seemingly no issue.
As nothing has changed, the only two conclusions that I can draw is either 1. There has been a software update in the background that has a bug 2. The hardware itself has an issue.
In my experience hard tends to be an all or nothing thing. Which leaves me only with hidden software update which I wasn't aware that it was caperable of.
I am running Mountian Lion (10.8) on a 2.4 Ghz Intel Core 2 Duo.
Any ideas?

For the software update it has to be initiated by the user, unless you have it set to update automatically.
Usually a connection timeout is due to the computer not being able to communicate with the router properly. Are your ip setting set up as static or dynamic? Also have you tried deleting the network from your preferences and adding the content in again? As sometimes the issue can be a setting was wrong. If this doesn't solve it you can call in if you are within your complementary ninety days phone support or if you have Apple Care and an Apple employee should be able to assist you.

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tomasvaril wrote:
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Message was edited by: GraceTurner

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No more ideas.....Kevin
Attachments:
error.PNG ‏12 KB
clone_error.PNG ‏30 KB

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