System does not automatically reconnect to wifi network after sleep/restart

My iMac G4 (2GB RAM, 10.5.1, AirPort Extreme) does not automatically reconnect to my wife network after waking from sleep or restart. I just recently switched the iMac from a wired to wireless set-up though the machine has always had the AirPort card. In wired mode, it always automatically found the network.
Network preferences have the "Ask to join new networks" checkbox selected. Below the checkbox it reads "Known networks will be joined automatically."
My wireless router is Linksys WRT150N, security type is PSK and encryption method is AES key.
Anyone have any suggestions?
Thanks!
bk

I'm having the same problem, the only way i can connect to my wireless network is to restart the computer, and open safari immediately. Then once it goes to sleep or i shut the notebook, i have to restart it again to use the internet. It's driving me nuts, and nobody knows how to fix it. I've tried firefox (it didn't help) and my sisters macbook connects just fine to my network, so it has to be a network setting. I'm going to schedule an appointment with a mac store tomorrow. so I'll post again when they fix it for me. hopefully i will understand how they solve the problem so i can post it to you guys

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I have to manually Open Network Preferences and choose my home airport (or office network) every time that I wake up from sleep. I would like to have it automatically choose the network. Is there any way to fix this?

Not I solution, but I am hoping a similar issue to provide more insight. I am seeing your auto-connect issue, but I only seeing the issue on the first network listed in the preferred networks. I recently switched the order of of my preferred networks, and the auto-connect failure was immediately switched to the "new" first network.
To elaborate, I have never had issues with my home network. However, a few days ago I switched my home network to the top of my preferred networks list. Now I must always select my home network to connect. Also, I was always having problems with my parent's network, which was first in the preferred networks list. Now that it is second, I have no problems connecting to their network automatically, when waking from sleep or from a clean boot.
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In may case the network was already at the top of the preferred networks list.
Based of of a hint over at MacOSXhints.com, here's how I fixed this problem:
1. In the Network references pane, delete the Airport connection that does not like to reconnect.
2. Click Apply and Quit the System Prefs app.
3. Put the computer to sleep.
4. Wake the computer.
5. Go back in to the Network pref pane and re-add the Airport connection. Do not try to connect to the network at this time.
6. Click Apply and Quit the System Prefs app.
7. Use the Airport menubar app to connect to your network.
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To see if you computer even needs this fix, I would suggest you click on Software Update...
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Every time my IMAC is unused for a period, then goes to sleep mode, it loses it's wireless connection and when I wake it up, it DOES NOT automatically reconnect. I have to go to systme preferences network and request that it reconnect.

My iMac is set up wireless. Everytime it's allowed to go in sleep mode, it loses wireless connectivity. Then, when I wake it up, I must go to System preferences, Network, and request it to reconnect to my home wireless network. It always does this successfully, but it's quite annoying that it seems unable to achieve this on it's own. My iPad 2 and kindle can do this, why not my iMac?

This appears to be a known issue, there are a couple of things both of you should do, first file a bug report in www.apple.com/feedback.
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System does not automatically reconnect to wifi network after sleep/restart

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