When iMac Sleeps, AirPort Disconnects: Why?

I took delivery of my iMac yesterday (my first Mac), and my problem is this:
After awakening the iMac from sleep, the wireless Internet connection is lost and I have to go through the few clicks to select the wireless network, etc. It's then reconnected fine.
Shouldn't the wireless Internet connection be maintained through sleeping?

Make sure that there is only one choice for your Mac. Old networks that you setup and old preferred network passwords can confuse your Mac, especially if you migrated old user accounts when you originally setup this Mac.
The old networks can be found in System Preferences>Network>Air Port. Press the Advanced button. In the AirPort pane you will have to highlight each network listed and remove it by clicking the "-" button below.
Old preferred network passwords are in your Keychain. Go to Apps/Utilities/Keychain Access. If you sort the passwords by kind they should be labeled such as Airport Network Password.
When you designate a wireless network as preferred, the password is saved to the keychain. So if you make sure that your iMac only has only one preferred network from which to select, upon startup or waking, it should ignore all the other wifi networks drifting around your location and make a beeline to its one preferred choice.
I hope something here applies and is helpful.

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Time Machine backup disappears when iMac sleeps

Tried finding this topic but could not find the specifics. I have an Intel iMac running 10.6.7 and I use a Mercury enclosure with a Seagate Barracuda 2TB SATA for Time Machine backup, connected with FireWire. Every time my Mac goes to sleep overnight, the next morning, the Time Machine icon disappears from the desktop. It's been disconnected, because when I run Check Time Machine, the log reads thusly:
<<Thu Apr 21 10:29:30 com.apple.backupd-auto Not starting scheduled Time Machine backup - time machine destination not resolvable.
Thu Apr 21 12:30:05 [0x0-0x2d22d2].backupd-helper Not starting Time Machine backup after wake - failed to resolve alias to backup volume
>>
Occasionally I'll get the error message on the Mac that a device has been "improperly disconnected" but most of the time when it sleeps the TM drive icon just goes away (even tho the backup drive is still on).
Any ideas? Can I fix this or have to live with it? Are there alternatives to TM that may work better?
Thanks for any help/suggestions.
Best,
Mike

I had the same problem as Bru-Hed, but with a Samsung G3 Station 1 TB with USB-connection. After waking up the MAC the message "improperly disconnected" appeared. Was happy with the solution you gave and changed the power save settings accordingly, the drive holds its power, but....... things did not change. Switching off the MAC and restarting gives no problems with the back-up drive, but after waking up I have to reinstall the back-up drive every time by disconnecting and connecting the USB-connector. After choosing the drive again in Time Machine, everything works properly until the next time the MAC goes asleep......
Any other solution to this problem ?

Ethernet disconnects when imac sleeps

When i put my imac to sleep, it seems to disconnect from the ethernet that is plugged into the back.
When i wake it up and log it back in, any applications that was signed in, like lync messenger are logged out and it takes a good 10 seconds to be able to browse the internet.
I'd love to just put my display to sleep and not the computer itself, however I work in an office and need to be able to lock my machine when i walk away.
I use CMD ALT EJECT to put my imac to sleep. And i am using the latest OS.
Please help

Try the following suggestions:
http://support.apple.com/kb/HT3964 Intel-based Macs: Resetting the System Management Controller (SMC)
Require a password after waking your Mac
How to lock your screen in OS X
=============
And i am using the latest OS.
Which is Yosemite. According to your profile you show--> OS X Mavericks (10.9.1)
Conflicting info: Please update/correct your profile so that you can receive the correct troubleshooting suggestions. This will assist the users in trying to help you. Thank you.

Wireless Quits When iMac Sleeps

Can someone help me out with the following annoyance?
Every single time that my iMac wakes from the sleep mode, I lose my internet connection.
I'm automatically presented with the Network Diagnostics window when this happens and as soon as I select my Network name from the list, the connection is immediately restored.
But why is the connection lost every time the iMac shuts down?
Cheers
John

I think that I may have found the answer, at least in my situation. If I understand correctly, every time the Mac goes to sleep, it turns off the WiFi card. The key to ensuring that the connection is renewed again when the Mac powers on again, is to make sure that the - Ask To Join New Networks - box is checked
in my case, just as the Screen Shot shows, it wasn't. I have of course checked it now and hopefully that will be the end of my problems with the WiFi constantly conking out.
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After Mavericks Update Arris Modem now going to standby mode when iMac sleeps

After installing Mavericks on iMac, whenever the iMac (connected wirelessly to the network with Airport Extreme 5th Gen) goes to sleep it is causing our modem to enter standby mode which limits internet access to all devices on the wireless network even when they are actively requesting data from the internet. As soon as the iMac is woken up the modem comes back out of sleep/standby mode and everything works fine. The modem is connected directly to the Airport Extreme WAN port and all devices just use wireless internet. The only resolution I've found is stopping the iMac from entering sleep mode in Energy Settings but this is not a long term solution. Anyone else having this issue?
The modem we have is an Arris TM722G.
Thanks in advance.
I've also tried resetting PRAM, creating a new network location, releasing and renewing IP.

If you can get the computer to start in Recovery, then access OS X Utilities,
an attempt could be made to Repair Disk using the Disk Utility there...
Several instances of an upgrade leading to issues in Mac OS X was due
to some previous condition in the computer, or problem in the hard drive,
or maybe insufficient or low-quality RAM installed; among others, before
the last OS X upgrade was installed. And then the extra effort of processing
a new OS on top of other bits, can cause the computer to act up or fail.
What was the previous OS X version? How old is the iMac...?
Did you upgrade from Snow Leopard 10.6.8 to Mavericks 10.9.2?
•Apple - OS X Recovery restores your Mac
http://www.apple.com/osx/recovery/
•OS X: About OS X Recovery
http://support.apple.com/kb/ht4718
•OS X: About Recovery Disk Assistant
http://support.apple.com/kb/ht4848
•OS X System Recovery: Explored & Explained - Tuts+ Mac computer skills tutorial
http://computers.tutsplus.com/tutorials/os-x-system-recovery-explored-and-explai ned--mac-60375
There may be a hardware problem behind the issues your computer
presents, and a diagnostic inspection &/or testing may need to be
done at a Genius bar, at an Apple Store; this is cited as a free service
at US and Canada Apple Stores. If you do not have one, you could
enlist the aid of an independent authorized Apple service company
who has trained technicians on staff; these are often also resellers.
Good luck & happy computing!

Iphone disabling router when imac sleeps...

I have my iMac behind an SMC Barricade SMC7008ABR router. I recently upgraded the router firmware which I suspect is the reason why I've started seeing this problem on a network that's been stable for years.
When I put my iMac into either software or hardware sleep, and only if I have my iPhone connected to the usb-docking cradle, within 1-3 seconds, the router suddenly resets itself and then proceeds to berserk itself. All the nodes on the network come down, and the light show begins on the front panel.
Power-cycling the router does not work. Nor will the router reset itself until such time that I remove the iMac from it's slumber.
Unplugging the iPhone (gen 1) from the cradle and sleeping the box does not affect network operations.
I can duplicate this every time.
The router is my DHCP server as well. I can provide more data if requested. Have searched the forums and google'd the problem but couldn't locate any helpful information.
TIA

progress: I unchecked the power-options box: wake for ethernet admin access, and that seems to have solved the issue.

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I have a 2nd monitor connected to my 21" iMac (late 2013) with Mavericks via displayport/thunderbolt port to HDMI. I had the same one with the same link connected to my old 2010 Macbook Pro, and I never saw this.
What happens is when the computer goes to sleep, all of the windows on the second screen move to the iMac, and my Wacom tablet even goes from being mapped to ONLY my second monitor to being only mapped to the iMac!
This is kind of driving me crazy, and I have searched and Googled and just can't find a solution.
Any ideas would be rad. Thanks.
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Try a reset > Mac OS X: How to reset the printing system

Firewire drive does not sleep when iMac sleeps

My G-Tech G-Drive Mini connected via Firewire to an new iMac will not spin down when the iMac goes to sleep. It does spin down with the iMac active, but will spin up when the iMac goes to sleep. On a MacBookPro with Tiger, the drive will spin down when the Mac sleeps, which I would expect to be the "normal" behavior for an external drive. Is this a Drive issue or an iMac Firewire bus issue?

By the way Bosanac...
Welcome to the Apple Discussions!
It seems as though I had a similar issue with my ministack external drive and I stopped using it and I have used several different external drives with all my Mac including my iMac. It's definitely hard to say as I would lean more towards the G-drive. I would contact G-Technology and see if they have nay suggestions.
Keep in mind that there have been many issue with OSX SL and that too maybe an issue.

Loud hum when Imac sleeps

i've been using my imac g5 for a few months with no issues what-so-ever. just recently i've run into one major issue. when the computer puts itself to sleep...i get a loud humming noise that will not stop (i think its the fan running. the power button is disabled and i have to unplug the computer and plug it back in to restart it. any idea what the problem is? i think i may have changed the power saver settings just before this issue surfaced, but i'm not sure what would cause this to happen.

What it's doing is going into sleep mode and this is normal. You should be able to wake it up just moving the mouse or pressing any keys on the keyboard. What I want to find out is whether it's hanging up when it goes to sleep or if it will wake up normally as it should regardless of the humming sound. To check the Energy Saver settings go into System Preferences/Energy Saver.
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When I wake my iMac I get the error message that my hard drives were removed, could cause damage, etc. This just started today. It's almost like the iMac kind of goes into a deeeeeeeep sleep... but the computer doesnt shut down totally. I can still wake it, takes a little longer than usual though.
Anyone know what the issue can be?
Thanks

Do you have an external drive attached?
The reason for asking is I have seen similar errors when I fail
to properly unmount or removes an external drive.
There may be a better way but when I want to turn off my
external drive (used for TM and SD), I right click on he
external HD's icon and select the EJECT option. This unmount
the drive so the power can be turned OFF and removed
from the back of the iMac. You can also do with the Disk
Utility.
Try unmounting your external drives and restart to see
if this helps.

Mail logs out of server when imac sleeps

Mail logs out of the server when computer sleeps

system preferences, security and privacy, general menu, unlock the lock and click on advanced.
Set the automatic logout to 999. That's 999 minutes to automatic logout.
Only do this if you really don't want auto logout. Like when you're doing a crypto-quality erasure of a backup hard drive or backing up to a blank hard drive (can take several hours for first backup).

Airport disconnect when go to sleep...

I would like to stay connected to my network. When the Mac go to sleep it disconnect and I have to confirm every time my connection. On the other hand my iPhone stay connected and the PC laptop of my girl griend to...

It is normal for the airport to shut off during sleep. While the MBA is waking from sleep, there is a period while the wifi scans and the computer wakes where it is not connected to the network. This is all normal but may seem stranger since the LED backlight gives you bright display so much quicker than any other computer. The MBA and airport still need wake up time before there is ready response to input.

I have an imac g4 purchased Dec 2003 runnung OS 10.5.8. It runs fine with airport off, but when I turn airport on it freezes with the black page, "restart by holding power key . . ." I swapped the airport extreme card with the one in my ibook G4 (purch

i have an imac g4 purchased Dec 2003 runnung OS 10.5.8. It runs fine with airport off, but when I turn airport on it freezes with the black page, "restart by holding power key . . ." I swapped the airport extreme card with the one in my ibook G4 (purchased same date and running same OS). No change in operation.
I am running wifi from verizon. Recently changed from mifi2200 to jetpak 4620 in a 3G location. Ibook running fine, desktop freezes. If I can boot desktop in safe mode and get airport turned off in time. then I can reboot regularly and imac runs flawlessly with no wireless.Have run disk utilities and TechTool Pro rebuild etc, but nothing has worked. How do I fine the culprit?

the power logix thing was really sad. apple changed so much after 10.4.8 that there wasn't a viable way to patch the software.
That statement is precisely why I don't believe in blindly updating the OS, especially in a non-standard machine.
We can't expect third parties to support us forever, and it is shameful to break something that works fine, except that we updated the OS....
I think that any upgrade or modification to a machine or the OS greatly increases the risk of trouble or incompatibility with current configuration and "new" system files.
After all, the component or software could only be tested as far as the current OS version when the component or software was released.
Beyond that, we are all "beta testing".
Following a beta tester protocol, and applying updates to a cloned system drive first, is a prudent way to approach updates, and not only for older, heavily modified machines.
After 10.4.8 and moreso with Leopard, the focus is primarily on Intel architecture, not PPC architecture.
Like it or not, we are all updating to the abyss of the extinction of our machines, unless we can be satisfied with the last stable version of OS that works well with our hardware and software.
I wish they would include the latest pkgs at least with software update.
Yes, having individual packages, rather than lump "OS X 10.x.x" updates would be nice.
This way, one could update as one sees fit. That is to say, for example, fix the Quicktime, but leave my Network alone, etc., etc.
In all fairness, Apple does provide for some breakdown of updates, but I believe there is much room for improvement, especially, as you point out, with regard to the core services portion of the OS.
Until then, I'll leave Software Update disabled.......

Imacs go offline when they sleep

Hi,
I have 11 intel imacs and use ARD to admin them but when they sleep they seem to sever the network connection resulting in a communication error when I try to remotely wake them. Also I wanted to look into the use of them as Logic Pro nodes for our main studio G5 but as they sleep the nodes get disconnected.
Anyone know how to disable the network sleep?

As mentioned, your network connection will be dropped when your Macs sleep. There are utilities out there like Wake550 that will allow you to wake your Macs over the network. I have never used it, but have heard good things about it.

HT3728 every time my iMac sleeps or restarts it loses the connection to airport express and i must reset and connect with router via ethernet cable.

Every time my imac sleeps or restarts it loses the wireless connection with my airport express (used for streaming music). I then have to disconnect the airport express from my stereo, bring it to my router, connect it to my router with ethernet cable and reset the wireless connection. Even with my airport express in the same room as my router Airport Utility cannot find it until i plug in an ethernet cable, so i do not think this is an issue with my wireless network. Router is a newer netgear.

Hi there frustrated newbie 2014,
You may find the troubleshooting steps in the article below helpful.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
-Griff W.

When iMac Sleeps, AirPort Disconnects: Why?

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