IMac doesn't automatically reconnect to wireless

Hello
i have an iMac middle 2007 with the latest Lion upgrade (10.7.4 11E53).
I use a Wireless connection, and I noticed that when my router restart my iMac doesn't connect automatically to its WLAN.
So, basically:
1. my iMac is connected to Wireless and Internet
2. the modem/router turns off
3. the modem/router turns on
4. iMac doesn't connect automatically (waves on wi-fi icon are grey)
I tried with resetting PRAM, deleting the entry of wireless on Key-Ring and re-saving it, read a lot of forums but i haven't found a solution.
It is an huge problem to me, i haven't that problem with my iPhone 4 and the modem/router is working correctly with others computers at home, so it's not a signal problem.
I can't explain why but my router sometimes is restarted at night, while i'm sleeping and my iMac should download gigabites of Legal stuff.
I just want that my iMac it works like my phone and any other pc
Thanks for any suggest and - PLEASE - avoid pointless comments like "don't restart your router"

SRS,
I have done the following to eliminate my iMac's desire to hook-up to whatever wireless system it wants: on the Network panel of System Preferences, with "Location: Automatic" go to "Show: AirPort" and the "AirPort" pane where I add my wireless network's name and security method (also delete all other networks listed), then above that change to the "By default, join: Preferred networks" and click the "Apply Now" button. Then click the "Options..." button and setup as: "If no preferred networks are found: Ask before joining an open network"
Then check the next two boxes for "Require administrator password to:
Change wireless networks
Create Computer-to-Computer networks
and uncheck the last three boxes. (unless interference robustness is needed due to signal interference from nearby systems or other sources)
Then click the "OK" button on that pane, and again click the "Apply Now" button.
I figure this solves most every issue that could come up for me. Hope it helps you.

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