How do I set up a permanent wifi network connection?

Hi all,
I had been using my D-link wireless router for a couple of years, when it just gave up the ghost this week. I happened to have a spare linksys wireless router which I then set up, and it works fine. My desktop pc connects fine, and my visiting friends hp laptop connects fine, on a permanent connection.
However, my MacBook Pro, whenever I close my MacBook, and then open again the next day, or later on that day... When I try to connect via the newtwork symbol in the task bar at the top, I get the message (a connection timeout occured) . Each time, I have to go into system preferences > Network and I have to set up the connection with a different location (current home8!), and retype in my passphrase. I have tried locking the connection so that no changes can occur, but that doesn't help .
Is there a way that I can just make this connection permanent? Why does this only happen on my MacBook, and not the other computers on the netwok?
Thanks.

Some of the following you may have already tried - Change your router channel. Sometimes this is all you will have to do.
Power cycling the router. Read the router's user manual or contact their tech support for instructions.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
System Preferences/Network- Unlock padlock. Highlight Airport. Network Name-select your name. Click on the Advanced button. Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined." Click the OK button and lock the padlock. Restart your computer.
http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
Other resources to check into:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
Non-responsive DNS server or invalid DNS configuration can cause long delay before webpages load
Netspot
How to diagnose and resolve Wi-Fi slow-downs
Pv6 troubleshooting
Mac OS X 10.6 Help: Solving problems with connecting to the Internet
What Affects Wireless Internet?
Solutions for connecting to the Internet, setting up a small network, and troubleshooting

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Message was edited by: softwater

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How do I set up a permanent wifi network connection?

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