My iMac suddenly goes to sleep

My I hear some views why my iMac (intel core duo2) goes to sleep suddenly, i.e., even just say browsing the web or doing this message. Thank You.

... and may add that when the iMac is in "sleep" NO KEYS or MOUSE CLICK could wake it up EXCEPT that I have to push the power button FIRST then any other keys before it wakes up.

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How do I stop iMac from going to sleep automatically after 15minutes of inactivity

How do I stop imac from shutting down automatically after 15minutes of inactivity, trying to play music but the imac keeps going to sleep, tried changing power saving preferences to never shut down, never go to sleep, unticked put the hard disks to sleep, automatically reduce brightness, but still goes to sleep.

Try a PRAM/NVRAM reset.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. If issues persist, your Mac's logic board battery may need to be replaced. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board.

HT1776 Hi, my iMac screen goes to sleep but the fan stays on 24hrs and never stops?

Hi, my iMac screen goes to sleep but the fan stays on 24hrs and never stops? You can hear it running all night.
Appreciate any advice.I'm using Lion. Many problems started since using Lion!

The temps are a bit higher than I'd expect under normal circumstances, and too high while playing games, but what is the room temp where it is?
I def. think its a temp thing now. but why does it only raise when im playing games or watching videos online?
Games tipically press the CPU, Video Card, RAM, and everything else much harder than most apps.
It may be a Fan not working properly, or just dust buildup.
Boot off your Install Disk while holding down the *d key*, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT. Some models have a separate AHT CD.
Report any errors it finds.

IMac Suddenly will not Sleep

I have an iMac with i5 quad core purchased in Feb 2011 running OSX 10.7.3 that has suddenly stopped going into sleep mode. This is a recent development, it worked fine before. I can manually put it into sleep mode and it stays asleep until woken. I have repaired permissions, ran Onyx, booted in safe mode, turned off WiFi, desconnected all preferials, but nothing fixes the problem. System log doesn't seem to give any clues but I am not sure what I am looking for. Does anyone know if this is a problem related to the most recent OSX update? Does anyone have any additional suggestions on how I might track down and solve the problem? TIA

It was also the same problem for me. Finally simply have removed the Printer from the Print & Scan properties and did reinstall it. The printer was in orange and was marked as used. I did remember having print something few days before while the printer was not open.
I think this is the main problem most of people are experiencing when the computer do not sleep. I've read another tread about this and it solve the problem for most of the commenters.
So fixed.

IMac randomly goes to sleep / Previous Sleep Cause: -100

iMac (24 inch Early 2009, 2.93 GHz Core 2 Duo, Lion 10.7.3) randomly goes sleep.
No hot corners, never sleep setting.
It seems it goes to sleep more often when CPU is busy and graphic intensive jobs running (videos, gaming).
I cleaned up air ways by vaccume, but it did not help.
Temp monitor showed
CPU 55C
power supply 95C
northbridge 89C
graphic processer goes up to 86C
when it went to sleep for no apparent reason. Are those causing issue? If so what can I do?
/private/var/log/kernel.log says
   "Previous Sleep Cause: -100"
Any idea what this is?
Thanks!

I took the iMac to nearest AppleStore and they opened it and cleaned up inside.
After that, it has not yet gone to random sleep yet while I've been trying to reproduce heavy CPU/GPU load for ~1h (while I could make it happen in 15min this morning).
So far highest temp went down to:
CPU 55C             => 44C
power supply 95C => 72C
northbridge 89C     => 82C
graphic processer 86C => 70C
Tech at AppleStore bar didn't know what Sleep Cause: -100 is.

Imac Randomly goes into sleep mode...Hard to start

My IMAC G5 will randomly go into sleep mode while I am in the middle of using it. Typically the fan noise increases and than it auto goes into a sleep mode. It also has issues starting. I have to press and hold the power button for it to kick on while also hitting keys on the keyboard to trigger it. Help!?

Here is the system log it looks like its over heating?
Sep 22 20:37:11 Macintosh-2 mDNSResponder[23]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00805E00   en0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 1852846483
Sep 22 20:37:11 Macintosh-2 mDNSResponder[23]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00805E00   en0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 1852846774
Sep 22 20:37:12: --- last message repeated 1 time ---
Sep 22 20:37:12 Macintosh-2 mDNSResponder[23]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00805E00   en0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 1852847774
Sep 22 20:37:13 Macintosh-2 kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex (PHY regs 5,6:0x45e1,0x0005)
Sep 22 20:37:15 Macintosh-2 kernel[0]: IOSMUPwrController:: OverTemp notification
Sep 22 20:37:15 Macintosh-2 kernel[0]: PowerManagement emergency overtemp signal. Going to sleep!IOPMSlotsMacRISC4::determineSleepSupport has canSleep true
Sep 22 20:37:15 Macintosh-2 mDNSResponder[23]: Note: Frequent transitions for interface en0 (70.162.10.190); network traffic reduction measures in effect
Sep 22 20:37:21 ip70-162-10-190 configd[35]: setting hostname to "ip70-162-10-190.ph.ph.cox.net"
Sep 22 20:37:24 ip70-162-10-190 kernel[0]: System Sleep
Sep 22 20:37:24 ip70-162-10-190 kernel[0]: System Wake
Sep 22 20:37:24 Macintosh-2 kernel[0]: Wake event 0020
Sep 22 20:37:24 Macintosh-2 configd[35]: setting hostname to "Macintosh-2.local"
Sep 22 20:37:24 Macintosh-2 mDNSResponder[23]: Note: Frequent transitions for interface en0 (FE80:0000:0000:0000:0214:51FF:FE97:7AA2); network traffic reduction measures in effect
Sep 22 20:37:24 Macintosh-2 mDNSResponder[23]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00805E00   en0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 1852859586
Sep 22 20:37:29 Macintosh-2 kernel[0]: USB (EHCI):Port 1 on bus 0x4b has remote wakeup from some device
Sep 22 20:37:29 Macintosh-2 mDNSResponder[23]: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00805E00   en0/6 to FF02:0000:0000:0000:0000:0000:0000:00FB:5353 skt 8 error -1 errno 50 (Network is down) 1852860588
Sep 22 20:37:31 Macintosh-2 kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex (PHY regs 5,6:0x45e1,0x0005)
Sep 22 20:37:32 Macintosh-2 mDNSResponder[23]: Note: Frequent transitions for interface en0 (70.162.10.190); network traffic reduction measures in effect

My iMac keeps going to sleep

This started happening about a week ago. I have the Energy Saver "Put the computer to sleep when it is inactive for:" set to "Never". Also I keep the computer up 24/7 and it doesn't happen over night. But lately this is happened a few times. Yesterday, my wife called me at work and told me that "the screen was black" I asked if the light was pulsating on the front of the mac, it was. Tonight after work I was ripping a CD. I had dinner and went to the computer and it was asleep. I mentioned it to my wife and she told me it happened twice today.
Is it possible that some key sequence or something is putting it to sleep? Of course, I didn't touch it and it went to sleep. Is this a possible hardware issue? I still have the extended warranty (at home service). Should I have it looked at? Its not a huge deal, but I have it configured to never put it to sleep (I do how the "display" sleep after 2 hours of inactivity though.
Hope someone might have a suggestion.
Thanks.

If you still have AppleCare or it's covered under onf the G5 iMac extentions, and it turns out to be that... I sure think so.
Try some heavy lifting CPU wise with it, like making a big disk Image or burning one like before.
I don't remember the exact temp figures, but tyours does see high, iirc.
Looks like it is too high...
http://www.xlr8yourmac.com/systems/iMacG5cooling/imac_g5_coolingfan.html
90°C goes to sleep...
http://episteme.arstechnica.com/eve/forums/a/tpc/f/8300945231/m/515008370931/inc /-1
60-65°C good...
http://forums.mactalk.com.au/12/23696-imac-g5-cpu-temps.html

Since Yosemite, my iMac keeps going to sleep roughly every 10 minutes watching media

Since upgrading to Yosemite my trusty old iMac (mid 2007) keeps going to sleep roughly every 10 minutes whenever i'm watching media (either through a player or streaming online), regardless of power saving preferences. Everything else is working perfectly as it always has, as far as I can tell.
What am I missing? Are there new settings in Yosemite for this?

In addition to resetting the SMC as Link suggests.
You should also check and/or clean-vacuum the dust out of your iMac's air intakes to make sure that it is cooling properly.

PMG5 suddenly goes to sleep (When using Toaster Titanium)

Since yesterday my dual g5 2*2,7 have developed a new problem.
Im trying to toast a dvd for my sister as a x-mas gift, but whenever I start the encoding process the computer after a few minutes suddenly goes into sleepmode without warning. Im suspecting some sort of heating problem because if I wake it up shorty after it goes down in sleepmode again a lot faster than if I wait for a while. Any tips on how to verify any heatproblems? leaks maybe?
Message was edited by: Dryg

Get Temperature Monitor - 4.51...
http://www.versiontracker.com/dyn/moreinfo/macosx/19994

Macbook Air suddenly goes to sleep

Sometimes when I'm using my Macbook Air in bed in my lap the screens goes dark and it goes to sleep on its own. I think it may have something to do with having my phone in my pocket at the same time. Has anyone else experienced this?

Yeah I've noticed that about my MBA too. Not sure why it happens though.

My imac g5 goes to sleep while in use. typically when im playing games

For the last several months, my mac has been going to sleep during use. Typically when im playing games, like second life, or in any type of programs, but it has also been going to sleep while im watching videos on youtube or hulu. It's getting worse and worse, and once it goes to sleep the first time, it doesnt stay on long afterwards. When browsing the internet, its fine. I've recently backed up 40,000 images that I had on my computer, and deleted for more memory space. but it didnt stop it from going into sleep mode, it just doesnt go as quickly as it was before. I was told that it was a memory problem, but since i deleted all of the images off of my computer, the problem still persists. I even turned sleep mode to "never". Here are some of my computer stats:
Memory: 512 MB
Processor: 2.1 GHz PowerPC G5
Space Free: 104.18 GB
Space utilized: 128.58 GB
My monitor stays warm, never gets hot, but sometimes i can hear the fan blowing loudly when it goes into sleep mode
If anyone could help, i would greatly appreciate it =)
Message was edited by: mswilliams
Message was edited by: mswilliams

The temps are a bit higher than I'd expect under normal circumstances, and too high while playing games, but what is the room temp where it is?
I def. think its a temp thing now. but why does it only raise when im playing games or watching videos online?
Games tipically press the CPU, Video Card, RAM, and everything else much harder than most apps.
It may be a Fan not working properly, or just dust buildup.
Boot off your Install Disk while holding down the *d key*, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT. Some models have a separate AHT CD.
Report any errors it finds.

IMac keeps going to sleep

Hi there.
I bought a second hand Rev. A G5 2 months ago. It has always been noisy - loud fan and a whiny noise. It's a bit annoying but I can live with it.
My major problem is the computer falls asleep by itself. It's unpredictable when it will happen but it does seem worse when it's been turned on for a few hours. It will wake fine once it's gone to sleep but will usually go back to sleep a couple of minutes later. I usually leave it for an hour or so and then it's okay. I have wondered if the noisy fan is linked to this. Is the computer overheating all the time? I tried resetting the SMU but that didn't really work.
Yesterday trying to import into iMovie was near impossible as it would keep sleeping - and the main reason for switching was because I liked the idea of iLife and using it to make DVDs of our old home movies and photos.
I'd like to get this sorted as I love my Mac (my friends say I've become obsessed!) but it's starting to get to me. I've read lots of posts about similar problems but there doesn't seem to be a solution mentioned.
Please help!

Hi
My kid's Rev A falls within these serial numbers but Apple refused to believe there was anything wrong and sent it back to my dealer untouched! The CPU fan constantly sits at a noisy 5600 rpm and the machine goes to sleep frequently during processor-intensive Flash games on the internet.
It's now back with my dealer in the hope he can convince Apple to fix it - although I am convinced the problem only started when I loaded Tiger - it ran quietly on Panther.
Having owned more Macs than I care to remember (and with a beige G3 still running 24/7 as a server in my office) - I really think this is software related rather than hardware. Apple kit has always been pretty reliable!
Hopefully soon I will know one way or another!
PowerBook 17" 1Ghz - too many others to mention! Mac OS X (10.4.3)

My 24"intel Imac Keeps going to sleep -it is hot to touch in the top left corner of the case -is something about to fail .

My IMac works for 30 mins without a glitch then starts putting itself to sleep every five minutes after that - it is getting hot in the top left hand corner - my guess is that something is on its way out - anyone had a similar issue before .

Ran AHT - nothing wrong.
Did a full cleanup and verify as well.
probem persists.
Fan is always going
might have to go to an applestore..
max

Imac not going to sleep?

For some reason, my imac fails to go to sleep. I must do it manually. I checked the power settings and all seems ok.

Any external devices connected to the iMac (harddisks, scanner, iPhones, Elgato TV, etc.) and not ejected/disconnected ?
Stefan

My G5 iMac only goes to sleep when ADSL modem is switched-off

My iMac will only put istslf to sleep if I switch-off the ADSL modem. I had the same problem with my G4 eMac. If I switch the modem off, the computer will quite happily nod-off. If I leave the modem switched-on and I return several hours later my computer will still be running. Can anyone make any suggestions on how to overcome this?

Hi Mike,
Do you mean a D-Link 302G?
I know that many of the Optus supplied D-Link modems actually have "Optus -customised" firmware installed, which even D-Link refuse to provide support for. Was the modem part of an Optus "package" or was it purchased separately?
If it is an Optus one you have problems, because D-Link won't provide support for the Optus firmware versions of their product, and at present Optus won't provide support for them either if they are connected to a Mac.
I have a suspicion that the firmware may actually be related to the problem, given that the same issue seems to have occured with two different computers. Optus aren't exactly renowned for their Mac support these days, I'm afraid, though there are suggestions that this may improve in the near future - see http://forums.whirlpool.net.au/forum-replies.cfm?t=531367
It would be interesting to see if a different modem behaved better. With the revised firmware the regular D-Link info probably doesn't apply. No chance of borrowing a different one?
(For what its worth Netspace are an Australian ISP who generally seem to provide good Mac support - they started off as a Mac focussed service called "MacInsanity" , in fact . I've been using them myself for many years.)
Cheers
Rod

My iMac suddenly goes to sleep

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