IMac no longer connects to wifi (3 other Macs + iPod Touch DO).

My iMac 23" (3.06 GHz Intel Core 2 Duo, 4GB 1067 MHz, Airport card: Airport Extreme 0x14E4, 0x8E, fw version Broadcom BCM43xx 1.0, OS10.5.8) no longer connects to wifi. The connection has been dropping regularly over the past month or so and since this morning I can no longer connect wirelessly.
I also have a MacBook (2.4 GHz Intel Core 2 Duo, 4GB 1067 MHz, Airport card: Airport Extreme 0x14E4, 0x93, OS10.6.4), a G5 (Dual 1.8 GHz PPC, 1.5 GB, OS10.4.11) and a PowerBook G4 (1.33 GHz, PPC, 768 MB, OS10.4.11) that connect perfectly well - all using a Zyxel Prestige 600 series/Airport Extreme (version 5.7). All 3 "see" the AE Base station in the Airport Admin Utility. To join this network, a password is required and I need to add the device in Access Control. My iPod Touch also connects to my network without problems. All connected Macs are up-to-date software-wise. I did not change anything in the iMac's settings prior to the wifi problems.
The iMac does NOT see the base station (tried rescanning several times, unplugging the basestation, etc). It showed up a few times after I unplugged the base station but then disappeared again. Everything looks fine otherwise, the Network system preference says it's connected to my network. Airport status: full bars.
I have tried to connect the iMac directly to the base station with a cable and that worked. I have also changed the channel (which was set at 10) to 1. I've renewed the DHCP lease.
Looks to me this is an iMac problem, considering there's 3 other Mac's + an iPod Touch connecting to wifi without problems as I'm typing this.
What happens when I delete the system configuration? Will I also lose all of my base station settings? (I have a long list of "approved devices" in there that I'll need to copy).
Things tried:
- restarted computer
- restarted basestation
- unplugged basestation + restarted iMac
- switched off+on router + unplugged from basestation + restarted iMac
- renewed DHCP lease
- changed channel

HI,
Go to /Library/Preferences. Move all the files in the System Configuration folder to the Trash, restart the iMac.
That doesn't alter your settings, just resets Airport.
Carolyn

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Diolacles wrote:
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