Q: 27" imac wifi problems (intermittant)

Well, my issue has got more interesting.

The repairer picked the iMac up from my house - noting that the machine could not connect to the home wifi but the other computers could.

Got it back to his workshop, turned it on and "hey presto" - it found 7 wireless networks.

He did some more research and asked about my router - a Netgear DGN2000. Turns out he has the same one. so he brings it to the workshop connects the iMac to it and found that if left on the signal died. If you search the web for posts on this particular router it seems that it has overhearing problems - I checked and found these issues myself.

We seem to be narrowing down the problem. BUT it does not explain why all my other gears connects to the router but the iMac 27" wont.

Darren

hello
I have had similar since buying my new imac a few months ago and have had a new machines, card replaced etc and continue to have the problem. I have an iMac 24" and a few macbooks and all work perfectly with my time capsule including at the same desk the new iMac is located on. i have contacted apple and referred them to all these posts when they claim not to have seen my issue before. they advised that they cannot rely on postings on the discussion groups to direct their work as they do not have sufficient details. If you have not already done so please contact the technical support disk as this is clearly a problem that is widely reported but apple don't seem to know what to do about it

Hello everyone.

I have a 27" i5 imac that I bought just before Christmas, I had lots of problems with the wifi on it, it would not connect and when it did it was very slow, all while my cheap net book, iphone, xbox , ps3 etc in the same room showed full signal and a fast solid connection. Iv tried everything to try and resolve this. (with no success)

Today has been the worst day ever! I have been unable to connect under mac osx or windows 7 (bootcamp) this makes me think its not really a software issue. So i tried the one thing i really haven't tried! i moved my imac just a little bit. IT WORKED! My imac connected straight away!

This was only half the problem. Although i now had a connection it was really slow. (couldn't watch a youtube video). So while trying to load a youtube video i tilted the screen all the way up and it loaded in seconds! With the imac in this position i can stream HD video no problem. This is really frustrating as its not really practical.I think however this shows in my case anyway that there is no actual fault.

Try this out and let me know if it works for you. Im going to have to rethink the my entire room set up to try and accommodate this!

Yes, I'm also sure it has to do with overheating. When I aim a fan on the imac the wifi comes back, when I let it heat up the connectivity drops again.

Come on Apple, can we have a statement from you about this issue? And a fix maybe?

Have you written a letter and/or emailed Apple/Steve Jobs?

I'm wondering if he would respond if other users reported this problem.
Cheers!

kk guys, so after scouring the web for a solution to a similar problem i finally managed, i think to fix it. it is alot simpler than u would imagine but i think this may solve it, ive read that the aluminium cases cause issues with the wireless connection and that the adaptor on the imacs is placed directly behind the logo on the back of the imac so as to let signal through. when i had these issues i noticed that the imac worked alot faster online when the back of the imac was facing the direction of my router and it worked alot slower when it faced the oposite direction. make sure the back of the imac is facing the position of the router otherwise the connection will be really slow. When i did this my download speeds increased from a mere 3-5kb/s (unbearable) to a decent 1mb or so. So this caused a drastic improvement and i hope u guys can solve ur issues in the same simple manner.
Safe.

I'm now in a situation where Apple and Netgear both claim it's not their issue.

My computer is back from the repairer with no improvement. To be fair, he spent a lot of time trying to resolve the problem. But I've spent far too much time on it.

I notice that there is another discussion topic on this forum dedicated just to problems in trying to get the DGN2000 to work with MACs.

I'm going to buy an Airport Extreme and a new modem and I will see how that combination works.

Darren

Appears that I am not the only one having this problem.

Unwrapped a brand new iMac 27" I7 today, had trouble connecting to my local WiFi. Airport Status shows full bars but no internet connectivity. My MBP sitting next to it, has no issues connecting to the WiFi.

Finally, after turning Airport On and Off multiple times, I was able to connect to the internet. I then downloaded a 750+MB Software update and rebooted the machine. Unfortunately, I have not been able to connect to the internet from the iMac ever since.

Browsing /var/log/system.log it shows the following sequence repeat when I turn Airport on from off:
<snip> configd13: network configuration changed.
<snip> mDNSResponder34: RegisterInterface: Frequent transitions for interface en1
<snip> UserEventAgent105 ** ERROR: SCNetworkSignatureCopyActiveIdentifiers returned nil

HELP ... the iMac is useless without Wireless internet connectivity.

Here is a workaround that has worked for me thus far. I am using Static IP addressing as opposed to Dynamic.

The way to do this is via System Preferences > Network > Airport > Advanced > TCP/IP;

On the TCP/IP tab, select "Manually" for Configure IPv4; enter a Static IP address on your subnet (e.g. 192.168.1.15), the subnet mask (e.g. 255.255.255.0), the router gateway IP (e.g. 192.168.1.1); On the DNS tab assign the router gateway IP (e.g. 192.168.1.1). Finally Click 'Ok' and then 'Apply' on the Network Tab.

Let's see if this work around lasts.

Hope that works for you all as well.

Enjoy ...

I've the same problem: 27" iMac - must be about nine months old - currently showing between 1 and 5MBS on my 20MBS link (via WiFi). My iPad and iPhone next to it get 15MBS. I've rebooted, messed with WIFi settings and none make any difference.

Well, I'm back to square one. I bought a new Airport Extreme and a modem and connected everything up.

The iMac 27" worked for all of about 10 minutes and then stopped recognising my home WiFi network and now can't discover any networks. All of the other computers, phones and game consoles connect just fine.

I'm a couple of hundred dollars out of pocket and no better off.

I'm going back to Apple to re-open the support case.

Darren

I too am having the same issues as described with my 27 inch iMac 3.06. Duo core. Normally i wouldn't mind but my new residency has wifi only whereas i used to connect via Ethernet cord. I have no access to the router so this is a huge inconvenience. Just thought I'd add to this growing list of upset apple consumers

Hey guys, wow I am happy this isn't a unique issue to me. I thought my wifi card was at fault. Guess its some sort of a early adopter issue, driver problem or something eh?

So here is my symptoms.

My mid 2010 imac with a core i7 that I just received a week ago doesn't work well with 5ghz wifi range.

It won't come start up with a 5ghz wireless N signal upon startup. When I do a continuous ping to the wifi router im connected to when it finally does come up which takes multiple reconnections, because the logon associations stalls out, it periodically has delay's in the the 600ms +. I switched to 2.4 ghz and that is better but I still have issues. It will logon with it, but I do find myself with periodic packet drops etc.

It's frustrating, but considering the randomness of it, I doubt its a hardware issue. I can't be getting 100 percent signal now,

I am starting to

I would like to clarify I also own a Mac book pro, bought August 10th 2010 as well, and that has none of the issues mentioned. It stays connected to the wifi hotspot with 5ghz, a the 2 ms response time range consistantly, there are absolutely no symptoms like the Imac 2010 has with its wifi card.

I am using a linksys wrt610n

Here is my wifi setup:


Software Versions:
Menu Extra: 6.2.1 (621.1)
configd plug-in: 6.2.3 (623.1)
System Profiler: 6.0 (600.9)
Network Preference: 6.2.1 (621.1)
AirPort Utility: 5.5.1 (551.19)
IO80211 Family: 3.1.1 (311.1)
Interfaces:
en1:
Card Type: AirPort Extreme (0x168C, 0x8F)
Firmware Version: Atheros 9280: 2.1.9.8.1
Locale: FCC
Country Code: US
Supported PHY Modes: 802.11 a/b/g/n
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165
Wake On Wireless: Supported
Status: Connected
Current Network Information:
chadnetwork1:
PHY Mode: 802.11n
BSSID: 0:25:9c:d2:5b:40
Channel: 6
Network Type: Infrastructure
Security: WPA2 Personal
Signal / Noise: -56 dBm / -96 dBm
Transmit Rate: 130
MCS Index: 15