IMac no longer connects to Wi-Fi on startup or after manual sleep

Hello folks,
I need some suggestions. Here is a description of the problem (as brief as possible):
My late '09 21.5" iMac spur-of-the-moment didn't connect to my wireless network on a random day (2 or so weeks ago). I thought nothing of it, until I noticed it happening after I put it to sleep that same evening. I turned it off hoping it wouldn't happen again.
It did.
I have since been in contact with an Apple support person (it's still under warranty) and haven't talked to him in a while. I'm going to call him within the next few days (back in school now) to see if he has any solutions. Here is some more info without stories:
Tried:
Deleting preference files (all related to Airport and System Configuration
Removing the Airport service altogether and adding it back on
Turned router off and back on
Changed routers completely (from an old Netgear to a new Netgear from Comcast)
Turned modem off and took backup battery out
Removed all references to wi-fi networks in Keychain Access
Turned Firewall off in Sys Prefs and in Antivirus software (which will be deleted soon)
Removed any unused login items/programs
Other tidbits:
Only happens at start-up and when I put it to sleep (not if it goes to sleep itself)
Message pops up about no preferred networks being available as soon as my desktop loads up (my network is always on the top with 5 bars)
Nothing changed on my Mac or Internet or environmentally
During these changes I've restarted my Mac some 20 or 30 times.
Running 10.6.4 and have all updates.
Trust me, many things were covered in our 3 hour phone conversation. And as I said earlier, I will be calling him soon.
I have never had a problem with my Mac before and am curious as to why this has happened so spur-of-the-moment.
If you need any other specs, please ask.

My previous 27" iMac is also '09 model just like your 21.5" iMac. I had the same connection issue as what you have described. But once the wireless connection had been made manually, the connection was rather reliable with reasonable bandwidth and without dropped connection. The problem was not resolved until Apple released updates for Mac OS 10.6.4 and transmission power of wireless router was increased to maximum. I suppose the problem was partly because of changes to aluminum unibody casing and smaller antenna. The only difference between your setup and mine is different wireless router (Netgear vs Airport Extreme).
If you are confident on good signal strength, perhaps execute Software Update from Apple icon on main menu bar to make sure that all updates have been applied properly. Last resort is to reinstall Mac OS 10.6.4 from scratch with all updates applied. There is also one easy way to monitor signal strength after connection has been made manually, pressing on option key while right clicking on Airport icon on main menu bar. The field RSSI indicates signal strength in negative dB value (smaller negative value means higher signal strength).
If you do not want to mess with the Netgear wireless router, one way is to bypass iMac built-in antenna all together by using Airport Express. Based on my regular monitoring of signals on iMac and Airport Express, Airport Express has much higher and consistent signal strength than unibody iMac. Plug in Airport Express on power socket outlet near your iMac, connect a Ethernet cable from iMac to Airport Express and use Airport Express as wireless bridge between main Netgear wireless router and iMac. Better still if you can afford to discard the Netgear router, just replace Netgear with Airport Express all together and use newer 802.11n protocol instead of older 802.11b/g protocol for better speed and range (assuming the Netgear router does not support 802.11n protocol). The Airport Express can also be doubled as base station for sharing printer and speaker in wireless network.
Apple has to assume responsibility to ensure all its Airport wireless products work properly with all models of Mac whereas it is different story for other brands of wireless products. I once was using Belkin wireless router but had to switch to Airport Extreme/Express because of issues occurred whenever Apple released updates for Mac products. If there is problem between iMac and Airport Express rather than Netgear, there is no reason Apple technical support can ignore the problem (particularly if you have purchased AppleCare for your iMac which cover all Apple accessories as well).

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