Try a different Airport Channel.
Open AirPort Utility (Applications/Utilities)
Select the device you’re setting up, and then click Manual Setup. Enter the base station password if necessary
Click AirPort in the toolbar, and then click Wireless.
Choose a new channel from the Channel pop-up menu.
If that doesn't help, go to /Library/Preferences. Move all the files in the System Configuration folder to the Trash, restart your Mac and see if that made a difference.
Also, sometimes just turning off the router for a few minutes then turning it back on can help.
Update, If I am constantly using the iMac, all is well and good, it is only when I leave it for about 20 minutes, the Wifi Logo on the top right bar shows connected, but attempting to open a web page on safari takes. Sometimes, I have to turn the built-in airport extreme card off and on. It is very annoying. APPLE, please HELP !!!!! Please
Apple is not here, this is a user to user forum only.
If your Mac is near the router, Ethernet is a much faster connection.
The iMacs with the best wi-fi connects are the white ones in plastic cases, the G5s and the first Intel iMacs. That is because the case does not interfere with the wi-fi signal. On the aluminum bodied iMacs, especially those with the unibody case, the case interferes with the signal. The antenna is located on the rear of the iMac under the Apple logo. You may want to be sure that the antenna is pointed directly at your router.
Hi Carolyn, I did try the steps you had mentioned, but the problem still exists. I have a windows laptop right next to imac and no problems on it whatsoever. If I constantly browsing, the connection will stay stable and all is good. While should I just leave the iMac for about 10 min; safari won't connect, however the Airpot icon on the top right still shows full bars.
I so wish to find a solution to this.
I have been doing a lot of experimenting. I can absolutely narrow it down to the imac wifi card. It is NOT a signal problem either. How can it go from full bars, to loss connection and searching randomely? All the while all the other wireless devices in the house have no issues? I can understand if it was a laptop and you hit a dead spot while carrying it around your house, but your imac should be stationary and it loses connection randomely. Especially when booting up.
I have tried a wireless G router as well, it drops packets randomly when doing a continuous ping.
I have tried a wrt54g and a wrt 610n There is only 1 other wifi hotspot within range of my imac. I have tried it on 2.4ghz wireless n, 5 ghz wireless n and 2.4ghz wireless g. All of them randomely lose packets, but the most issues is definately with a 5ghz wireless N. I can't duplicate this on my mac book pro which is using a apple airport broadcom and my imac is using the atheros.
ype: Other Network Controller
Vendor ID: 0x168c
Device ID: 0x002a
Subsystem Vendor ID: 0x106b
Subsystem ID: 0x008f
Revision ID: 0x0001
Link Width: x1
BSD name: en1
Kext name: AirPortAtheros21.kext
Location: /System/Library/Extensions/IO80211Family.kext/Contents/PlugIns/AirPortAtheros21 .kext
I am no dummy when it comes to networking, I understand wireless technology. If there was an issue with log signal and finally a drop out or some sort of interference, it is painfully obvious every signal computer would have issues, not just the imac, especially when they are right next to each other, my wifi n 5 ghz signal drops out on the imac only, and there is my mac book pro right next to it, same hotspot same frequency humming along, no issues ever.
Here is the symptoms doing a continuous ping on a wireless G linksys wrt54g:
bytes from 192.168.1.1: icmp_seq=119 ttl=64 time=0.877 ms
64 bytes from 192.168.1.1: icmp_seq=120 ttl=64 time=0.953 ms
64 bytes from 192.168.1.1: icmp_seq=121 ttl=64 time=0.846 ms
64 bytes from 192.168.1.1: icmp_seq=122 ttl=64 time=0.931 ms
64 bytes from 192.168.1.1: icmp_seq=123 ttl=64 time=0.797 ms
64 bytes from 192.168.1.1: icmp_seq=124 ttl=64 time=4.041 ms
64 bytes from 192.168.1.1: icmp_seq=125 ttl=64 time=1.367 ms
64 bytes from 192.168.1.1: icmp_seq=126 ttl=64 time=0.919 ms
64 bytes from 192.168.1.1: icmp_seq=127 ttl=64 time=0.957 ms
Request timeout for icmp_seq 128
Request timeout for icmp_seq 129
Request timeout for icmp_seq 130
64 bytes from 192.168.1.1: icmp_seq=128 ttl=64 time=3056.812 ms
64 bytes from 192.168.1.1: icmp_seq=129 ttl=64 time=2057.405 ms
64 bytes from 192.168.1.1: icmp_seq=130 ttl=64 time=1058.114 ms
64 bytes from 192.168.1.1: icmp_seq=131 ttl=64 time=58.458 ms
64 bytes from 192.168.1.1: icmp_seq=132 ttl=64 time=2.395 ms
64 bytes from 192.168.1.1: icmp_seq=133 ttl=64 time=1.001 ms
64 bytes from 192.168.1.1: icmp_seq=134 ttl=64 time=0.869 ms
I would also like to mention that I tried it with no wifi security, wpa with tkip, wpa2 with aes. It doesn't seem to make a difference. Also I did notice it dosn't actually lose the association with the router under wireless G but it does randomely drop packets and have a sky high ping ms rate.
So here are the issues:
Randomly loses association and packets under 5 ghz wireless N with a wrt610n The association loss is especially bad when first booting up. And randomely has a high ping rate to the base station 1000ms + is not uncommon. It will go back down to 0.7 or less.
The association loss can only be fixed by turning on and off the wifi card sometimes several times.
Randomely loses association and packets under 2.4 ghz wireless N but less problematic then 5 ghz. HIgh ping rate is also not uncommon. Especially when scanning for new networks is active (selec the signal icon and it spings showing its looking for networks.
2.4ghz wireless g isn't as bad, no association loss but still lost packets and high ping once in awhile.
What have I tried to fix it?
Clear out network saved data and reassociate from scratch re entering the data, clearing it out of the key chain etc.
running latest version of mac os x 10.6.4
Tried different encryption types, wpa wpa2 with aes no security.
Tried assigning an IP address, dns server etc, no change in performance or symptoms.
Reinstalled Mac os from scratch, no change in symptoms.
Tried running it under windows 7 64bit, The issue isn't as common but I do recall having high ping rate. No loss of association though especially during boot up.
I plugged in a stand alone wifi card that works through the ethernet port, this had no symptoms mentioned. Consistant low <1ms ping times, no dropped packets and no loss of association even at boot up. This is at 5ghz wireless N.
I just really wanted an all in one computer and get rid of the cables. Going that route means why did I bother?
I havethe same problem. My new 27" inch IMAC is non-functional when it comes to Wi-Fi. All my Toshiba laptops are fine no matter where they are located in the house. Unfortunately for thw apple ethernet is not a option. I think it is a case of form over function. Apple IMAC wi-fi does not work. does anyone know of an external solution such as a USB wi-fi adaptor that would work with the latest IMAC