After reboot, iMac will not connect to wi-fi automatically

I very recently purchased iMac 27" with Intel i5. The issue is the wi-fi disconnects after rebooting the cpu. It doesn't connect automatically to the internet. It sees the router but I have to select it to connect. Although there is no need for me to re-enter the SSID password, it is a small inconvenience but I do not have to do this step for my other devices, like iPad, PC, etc. The wi-fi is there after waking up from "sleep" mode, so no issue here. I am currently using the OS X Lion. I also purchased the Mountain Lion but balked to install it yet because I read some reviews about it that it slows down some MacBooks (with retina). Could Mountain Lion have solved this wi-fi issue? Or should I take the iMac back to the store and let them fix it for me?

ML has caused more of this problem I believe.
Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
Click OK.
Also, turn off IPv6:
System Preferences » Network » AirPort » TCP/IP tab » Configure IPv6
Or whatever Interface you use.
If not take it back.

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Which OS are you using (update your user profile).Try a
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http://support.apple.com/kb/HT3964
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Wait 15 seconds.
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Take all the applicable steps in this support article.
Step 2
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Imac will not connect to Airport Extreme when configured WPA/WPA2
Posted: Jul 5, 2007 8:22 PM Reply
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Message was edited by: myhighway

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After reboot, iMac will not connect to wi-fi automatically

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