IMac suddenly has trouble with wireless connection

This is how it happened:
1. Landlord buys electrically faulty mansion
2. Landlord realizes he cannot keep up with mortgage and property taxes
3. Landlord subleases rooms to renters, including me
4. House has a power outage, iMac shuts down.
5. iMac recognizes wireless network, but shows that it has zero connectivity (which is false, because my two other laptops connect just fine, because their powers obviously weren't cut off abruptly)
6. Verified and fixed the iMac with installation disc, but still the wireless connection comes and goes on its own whim.
7. Tried shutting off nearby computers to see if it would take away any sort of interference. Worked, but after hours of working, iMac yet again fails to connect.
8. Tried assigning it IP ranges and all that - no luck there.
So what now, guys? Am I going to have to send my beloved iMac away for repair? It's the current model, if that helps. Any help would be appreciated...!

Just called apple support. This is what they suggest:
System management control reset:
1. plug out everything that connects to the imac
2. press the power button for 7 seconds
3. don't start the imac yet!
4. as SOON as you start the imac, press command/option/P/R.
If this doesn't work, then you need to pretty much bring it to the store to have it looked at.
This actually worked for me.

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Thank you for contributing to the Apple Support Communities.
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TenFourFox is the most up to date browser for our PPCs, they even have G4 & G5 optimized versions...
http://www.floodgap.com/software/tenfourfox/
I'd avoid vesrion 24 though, as it no longer supports plug-ins like Flash.
SeaMonkey seems pretty fast also, with many options...
http://www.seamonkey-project.org/
http://www.seamonkey-project.org/releases/
Might also look into iCab & OmniWeb versions.
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The last really supported Flash for PPC was 10.1.102.64, but if it's for like Facebook or such, people have been fooling FB to think they have a leter version installed.
Texas Mac Man's Flash hack/post...
https://discussions.apple.com/thread/3599648?tstart=0
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See in each Browser which version of Flash it thinks it has...
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A few days ago — after I ugraded my iMac G5 to 10.4.10 — my iMac stopped communicating properly with my network. It will connect to the wireless network and the Internet, but it will no longer print wirelessly or stream music to either Express base station. I have one base station connected to my cable modem and a stereo and another connected to the printer and another stereo. My MacBook, also upgraded to 10.4.10, has no problems with wireless connectivity, except that it can no longer find my shared iTunes library from my iMac.
When I run the Airport Admin Utility program, the iMac cannot find either base station.
I've tried restoring the base stations to factory setting, and today I ran an archive and install on the iMac. It still has the problems.
I've heard a lot of people are having wireless problems with 10.4.10. Anybody figured this one out yet?
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every since I updated my 17" macbook pro
I have the same problem.
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some times it'll disconnect 2-3 time in one minute.
and my internet is much slower now.
I feel like restoring the older OS.
I know this because I also have a powerbook 15" connected to the same network and it was never updated so it runs smooth
does anyone know how to remedy this
Thanks
sookie

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Please do 2-3 SMC and PRAM resets back to back and retest. Also use new cables, they can go bad.
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Should mention that I'm a daily Mac user for 20+ yrs (designer) and feel fairly comfortable diagnosing and solving any issues, but this one has me stumped.

I'm not sure about the original poster's "graphite" iMac, but if your "2nd gen" iMac refers to a "tray-loader" (CD goes in on a tray not a slot), you probably have the same problem I had... Later slot-loader iMacs many have similar problems, but I don't have first hand experience with them.
The most likely cause of the problem is a bad analog video board, specifically the part on it called the "flyback transformer." Do and Google search on "analog video flyback imac" and you should see some useful results.
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New problem with wireless connection since 27th No...

Main desktop computer (windows xp) is connected directly to the internet via ethernet cable to BTHub3. No problem exists with this connection.
We have previously had no problem connecting Tablet, laptop, and internet radio via wireless connection to our Hub. Problems now exist with wireless connection to all of these devices:-
- When attempting to use any of the devices wirelessly, we are unable to obtain a connection to our Network (shown on the list of those available) - indicates - "out of range" or "obtaining IP address" or "authenticating" or "network disabled - poor connection"
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Solved!
Go to Solution.

Wingman2, the first thing I would do is uninstall BTDesktop Help if you have it installed. It can cause more problems than it solves.
I would also suggest that the first thing to try is a factory reset of the homehub by pressing a pin into the recess button on the rear for about 20 seconds.
After you have done a reset if you still have problems, download, install and run inSSider. It will show you the wireless channels and which one your Homehub is on. You want to find the channel with the least congestion, ie. least number of users. Once you have that you need to change your homehub onto that channel.
See link for insider. Use the free version.
http://www.metageek.net/products/inssider/
See link how to change channel on homehub
http://bt.custhelp.com/app/answers/detail/a_id/14094
After that if you are still having problems you could try setting the home hub to b/g only instead of b/g/n. If one of your devices is not "n" capable it could help.
http://bt.custhelp.com/app/answers/detail/a_id/13768/session/L2F2LzEvdGltZS8xMzg4NzgxNjIyL3NpZC9Vd3p...

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Hello, this is my first message in this community so please bare with me if this message should be in the newbie part; but I think it's better fitted here. Other than that, I'm glad to be here .
After quite some time in Fedora I'm coming to Arch and I must say I'm delighted, so I wanted to use it in my laptop too which was running an old version of Fedora.
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Thank you for your tips lamegaptop. I already have linux-firmware installed and I'm using the supported kernel module for the card (it's a PCI one):
06:01.0 Network controller: RaLink RT2500 802.11g (rev 01)
Loaded modules for it:
rt2500pci 12420 0
rt2x00pci 3890 1 rt2500pci
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eeprom_93cx6 1004 1 rt2500pci
Rfkill is installed too, the output I posted in the first post belongs to the commands I entered in the Arch system. In Fedora rfkill always reports both blocks to be off.
As the Fedora system is running a 2.6.30.10 kernel I tried to run some tests using the LTS kernel (it's a 2.6.32.X right now) in the Archboot live environment, the output of "rfkill list" changed as seen below:
$ rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
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lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
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inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:264 (264.0 b) TX bytes:264 (264.0 b)
$ ifconfig wlan0 up
$ ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:264 (264.0 b) TX bytes:264 (264.0 b)
$ rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: yes
$ ifconfig wlan0 up
SIOCSIFFLAGS: Operation not possible due to RF-kill
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