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

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Mac Pro randomly goes into sleep mode

My (mid 2010) Mac Pro, OS X.6.8, randomly goes into sleep mode and I can't wake it, have to power it off and reboot. Just started to the best of my knowledge Friday (Jan 6, 2012) I've had it happen surfing the web in Safari, while working on an illustration in Adobe Illustrator, while running Apple Hardware Test, using 23" LCD connected by HDMI and DVI-D, Disconnected monitor and connected 12" Cintiq (LCD Tablet).
The monitor goes black, says "there's no signal coming from your computer", none of the keys will wake it. I have to hold down the power button until it turns off then power it back up. The time between the sleeps varies, 38min, 1hr 34min, 5min, 2hr 17min, 12min, etc. I disconnected everything (except keyboard, mouse, monitor) still the same. Opened and removed the ATI Radeon HD 5870, and noticed the PRAM battery, replaced it with a new one, thought that fixed it, worked for a long time then it happened again.
Tried Apple Hardware Tester again, it said everything is fine, ran it again an error popped up: 4SNS/1/40000000:Te1S-99.364, wrote it down then it slept.

The next time this happens open your mac and see if there is still a fan running. If so you are not sleeping, you are in a thermal cutoff. Keep you mac cover off.
Now reboot as you always do. Take a look at the fan in your 5870. Is it spinning? If so, try to keep an eye on it and see if you can "catch" it not spinning.
When the fan doesn't start, or if it does then stops, the card will overheat and the machine will go into thermal cutoff. The amount of time is variable.
I speak from experience. I am currently on my third 5870 video card. Both the previous two had this fan problem. The only wrinkle in my theory for you is that I wouldn't expect more that, say, 15 minutes of up time at the most, not hours like you got. But it may be that your card is starting ok, but stops sometime later. I chalk it up to the lousy fans Nvidia uses in the 5x70 cards.
FWIW, if you happen to catch the fan stopped before the machine goes into thermal cutoff you can give it a little nudge with your finger to get it going again.
I recommend one of the various temperature monitors. I use iStat Menus and display some key temps in my menu bar. Of course after going through two of these cards I am a bit paranoid!
Some other temperature monitors:
iStat Pro
Temperature Monitor
Hardware Monitor
Note, after typing all this I also realized you got a AHT 4SNS error. I would run AHT again to see if you get that error again. If so that means "Check Main Logic Board" and you may have a more serious hardware problem than just a video card! So my other recommendation is that when you machine fails again look inside for any lit diagnostic leds. There's some near the dimms but there are others on the board as well.

Early 2008 iMac (8,1) randomly goes into sleep mode

Hey,
My early 2008 iMac (8,1) on 10.8.2 goes into sleep mode by itself. I've played around in Energy Saver, tried resetting SMC, NVRAM, replaced HDD, reformatted HDD, installed smcFanControl, reinstalled Snow Leopard, Lion, Mountain Lion. None of that worked. Took it to the Genius bar, performed some diagnostics tests and they said everything worked properly. Does anybody have the same problem? I can still use the computer for general computer use (light web surfing and e-mailing), but it seems to go into sleep mode when I have a lot of applications open and especially when watching videos. I've tried researching this problem, but I've haven't found a definitive answer. Right now, the Genius that I've been talking to thinks it may be the RAM. I'm waiting on new shipments of test RAM to arrive at the Apple Store for him to properly diagnose.
Thanks,
Jason
iMac (8,1)
2.8 GHz Intel Core 2 Duo
2x2 GB 800 MHz DDR2 SDRAM
ATI Radeon HD 2600 Pro 256 MB
1TB 7200 RPM SATA ST1000DM003-1CH162
If you want to read the whole time line, I've included it here. I apologize for it being so long.
At first I was running Lion (10.7.5) and the computer would enter sleep mode whenever I was doing anything with video. For example, watching YouTube videos and chatting on FaceTime. And funny enough, I distinctly remember watching a bunch of movies with VLC and the computer did not go to sleep (Although, this is not true anymore). I could wake the computer up and use it, however within a few minutes the computer would re-enter sleep mode. The computer seemed fine and I could access all of my files. Tried resetting SMC and it did not resolve the issue.
I made a Genius appointment to see if they were familiar with the issue. The iMac passed the in-store diagnostics test; it said all the components were functioning properly. He told me to bring it home to do a fresh re-install of my OS and then run my computer to see if the problem persisted. I took it home and reformatted my HDD with a 35-pass erase, re-installed Snow Leopard (10.6.8) and declined to transfer any backups from Time Machine. I was using a fresh system and sure enough, the problem persited. Tried doing the same thing again but with Lion (10.7.5) and still no luck. So I made another appointment and it passed the in-store diagnostics test again. I let them keep the computer for a 24-hour diagnostics test. They told me they would diagnose my computer with the OS on my HDD as well as a copy of OS that the Apple store deemed 'good' on an external HDD. The Genius called me and told me that my HDD failed their 24-hour diagnostics test and recommended I replace it. I initially had a 750 GB HDD, and the Apple Store could only offer me a 500 GB HDD ($200). I opted to take my computer to Carbon Computing, an authorized dealer in Toronto, to have a 1 TB Seagate HDD ($170) installed with no OS on it. I brought it home, performed another 35-pass erase and installed Snow Leopard. Problem still persisted. Repeated with Lion, still unsuccessful. Looking back, I was so excited that I just had to replace the HDD to fix the problem, I forgot to ask the guy if he could recreate the issue.
I began to suspect that it was a heating issue. So I installed Temperature Monitor and smcFanControl, and cleaned the fans as much as I could without taking the computer apart. Without smcFC on I tried to recreate the problem and I noticed that the Power Supply Position 1 reached 95 degrees Celsius, and Graphics Processor Temperature Diode reached 97 degrees Celsius before entering sleep mode. I don't know much about temperature sensors and what they monitor specifically, and so I couldn't draw any conclusions from that data. I turned on smcFC and cranked the optical drive speed to 2000 RPM, HDD to 3000, and CPU to 3000. The computer still went to sleep but the temperatures were below 90 degrees Celsius before entering sleep mode. I've tried researching here and on the internet about normal operating temperature ranges of iMacs and generally found that most do reached that temperature but they do not go to sleep mode.
Then I thought it may be a problem with Lion so I upgraded to Mountain Lion. The issue still persisted. Tried resetting SMC and NVRAM, did not resolve issue.
I called the same Apple Store explaining to them that their recommendation of replacing the HDD did not resolve the issue. They told me to bring it in and have them check it out again. I went through the same process I did before; the iMac passed all of their diagnostic tests. The Genius told me this time he will test out the RAM. He called me and told me that he could replicate the problem and so he proceeded to put in a stick of 'good' Apple RAM, but the computer would not work. He said the 'good' Apple RAM was damaged, either before or in the process of putting it in. He plugged in my old stick of RAM and the computer worked. He tried to recreate the problem and claimed that the computer ran for over 24 hours with an existing movie on my HDD playing and it did not go to sleep mode. However, once I brought it home I played the same movie right away and it turned off 17 minutes into the movie. Tried resetting SMC and NVRAM again, ran the movie again, still went to sleep.
And that's the story for now...

Now to find out WHY it does it at home only. How hot is it at home? Have you checked the AC current/voltage at home?
Well they were able to replicate the issue at the Apple Store the second time I left my computer there. Anyway, we don't have any heating on at my house at the moment. It's usually from around 20-23 degrees Celsius (72-75 F). Temperature Monitor says ambient temperature is 30 degree C though...
I'm not really sure how to check the AC current/voltage at home, but my computer worked before I moved it. So I'm not sure if that is the issue.
I normally only have speakers set up to my computer and a wired keyboard. The speakers are powered separately. I would assume that at the Apple Store only the power cord and wired keyboard are connected.
What is the Power Supply Position? And what does it do?
Thanks for your help!

My laptop randomly goes into sleep mode

I'll randomly be on a site or listening to music and then all of a sudden it goes into sleep mode. I'm very aware that it goes to sleep while you've been away from your computer, but it'll go into sleep mode while I'm using the computer. I changed the power setting so that it takes longer to get into sleep mode thinking that would help, but it doesn't. I ignored it at first but it happens more often now and its getting annoying. Sometimes I'll move the mouse pad to wake it back up and it sounds like its going to come back, bit it just goes to sleep again. Its really annoying and frustrating and I don't know what's wrong with it. Anyone have any idea what's wrong with it and how to fix it? My warranty expired this passed March and I can't afford to get it fixed.

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Go to any good anti Virus removal forum, SpyBot S&D, Bleeping Computer, others, and start a thread.
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The forum Volunteers that assist you on these sites are busy and it may take up to 3 days for them to start your thread, have patience, they will help.
You may have inadvertently removed/modified part of your operating system (keylogger/screencapture) when removing the malware.
Do not just rely on a recovery point!
Hope you have recovery disks made, and/or a mirror image.
> Was your question answered? Mark it as an Accepted Solution!
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My iPad randomly goes into sleep mode while I am using it?

All of a sudden, when ever I use my iPad 2 it goes into sleep mode. It did it three times while I typed this message. As I am running an app it will just go into sleep mode with out me doing so and I have to press the home button to wake it up. Doesn't matter what app I am running. I have 4gb of storage available. Most of the time it brings me back to the app I was using when it went to sleep. Has anyone else suffered this issue. I am running the latest iOS 6.0.

What "issue"? This is perfectly normal. By default, all (fairly-recent) Apple products will go to sleep if left idle for a certain period of time. This is NOT normal, however, if in the app, you are pressing buttons on the screen. If you are doing something like reading, for example, try setting your iPad to not go to sleep that quickly.
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IMac G5 goes into sleep mode whenever given intense task

I saw a post about this early on the forum but the guy decided to just get a new computer so a solution was never thought of. my problem is whenever my computer is given intense task (mostly playing video off webpages) the computer will enter into sleep mode. It has done this countless times and has come to the point where its almost unbearable to use. I did notice that the back of the computer feels pretty out everytime this happens so im wondering if I have a broken fan. I have checked my logs and this is what it reads everytime the error occurs:
9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Info>: Starting up
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9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Debug>: Command callback succeeded
9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Debug>: Request finished
9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Debug>: Request started
9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Debug>: Command callback succeeded
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SchedulePowerEventResult = "AWAKEN TOOL ERROR";
"com.embraceware.awaken.error" = 0;
9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Debug>: Request finished
9/18/09 5:44:30 PM com.embraceware.awaken[3207] Fri Sep 18 17:44:30 Macintosh.local com.embraceware.awaken[3207] <Debug>: Request finished
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Message was edited by: envyracing

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24" imac goes into sleep mode and lights on circuit flicker

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I have a 24" imac and have found that when the display goes into sleep mode the lights on the circuit flicker.
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Here is a similiar post - https://discussions.apple.com/thread/2606099?start=0&tstart=0.      The resolution is probably you need to get the iMac serviced, what i'm wondering is what is the problem in the imac that is causing the issue.    Is this a defect?
Before anyone questions the circuitry in my house here is what I have verified.
An electrician has come and verified the electric panel is good and all circuit breakers are good.   All circuits in my house are copper, no aluminum.
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The sleep timeout has nothing to do with disk activity. It's based on user input, although some background processes can pre-empt it. If you don't want the machine to sleep automatically, disable automatic sleep in the Energy Saver preference pane.

My iMac goes into sleep mode, won't come out until I unplug and replug the computer then hit the power button. Just hitting the power button alone won't restart the iMac.

My Imac goes into sleep mode but won't come out. The keyboard/mouse won't rouse it and the power button won't do it either. I have to unplug the computer, re-plug it in and then hit the power button. Help?

I looked around the internet and found an old post that seems to have solved the problem. I had a relatively new USB port (powered) that I unplugged and, ta da, the problem disappeared. I'm not sure why this happens (I'm not a tech person) but it seems like this should have been worked out in testing somewhere.

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My iMac i7 quad was having the same symptoms with the blue screen and long startup times a couple of months ago. Apple Care told me to bring it in to the local Apple Store, and after some diagnostics, the hard drive required replacing. It took one day to replace the hard drive and my iMac is running great. I only had the iMac for about 12 months when the drive needed to be replaced. Not sure if that is your Mac's problem, but it was for mine.

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The computer has constantly gone into sleep mode after a few minutes of no activity. I can have iTunes radio playing, but the system still goes into sleep mode. As I am typing and moving the curser, the machine stays awake.
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I apologize for the angst. The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost.
I misunderstood the terms of the warranty. Thank you for your input and patience. Much appreciated. For the benefit of others that experience this with a new Mac that auto shuts down. Check the following:
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Hey Tecmo_SB_Guy,
I would suggest you take a look at advanced power settings. It can seem like the notebook is turning off when it is actually just hibernating. You can set it to not hibernate.
1. Windows key + Q to open the Search Bar
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5. In Power Options, Click Change when the computer sleeps, on the left.
6. Set the Put the computer to sleep setting so that it fits your usage best.
7. Click Change advanced power settings, at the bottom.
8. Expand Sleep and expand Hibernate after. If you want you can change the hibernation setting to Never by typing "Never" into the minutes field. See attached picture. You can do this for battery and/or plugged in.
9. Click Apply to save changes.
If you don't already shut it down periodically, I would suggest shutting it down at least 2-3 times a week if you use it daily. Leaving the computer running continuously can shorten its lifespan. Hard drive failures and motherboard issues are seen much more often on machines that are left running constantly. Computers get bogged down and run slowly when the memory is full. Memory only clears out and resets itself when the computer is shut down. Here is a link explaining more about memory accumulation and hardware aging.
I hope these suggestions help! Please let me know if you have any questions
Attachments:
PowerHibernateNever.jpg ‏59 KB

G4 going into sleep mode every 30 seconds

hello all-
I have been having a really nagging problem which I think may be owing to the recent 10.4.10 upgrade (since the problem didn't occur before then). Maybe someone else knows if the OS upgrade is the offender here, or something else.
Anyway- after about an hour to 90 minutes of use, my G4 PowerBook goes into sleep mode unannounced. It can be brought back out of sleep by holding down the power button, but it will go right back to sleep again within a minute's time, and will continue doing this indefinitely (as I discovered when trying to bail out all my recent documents, just in case.)
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-I've tried using the system while running on battery power and when connected to a charger.
-I also looked at similar problems on this forum, regarding the 'disk sleep timer' .plist. I can't find this exact file under /Library/Preferences/SystemConfig/com.apple.PowerManagement.plist, so perhaps that has something to do with it?
-I also made sure the display and computer settings were set to the maximum 'never turn off' level.
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Ok, I've followed your advice, gone into the system log, and I think I've isolated the problem (judging from the times that the message was received) to the following:
Jul 30 12:17:55 MyHD kernel[0]: Power Management received
emergency overtemp signal. Going to sleep.
I'm baffled why it would be receiving an overheated signal- the computer is in a cool environment, and on all occasions when it went into these sudden sleeps, it was running a bare minimum of applications. No external hard drives, printers, or anything else connected, either.
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My new macbook pro retina randomly goes into standby mode

My new macbook pro retina randomly goes into standby mode. I have to close the screen and wait a few seconds and re-open it in order for it to come back on.
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Well I fixed my problem.
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Problem solved.
BUT... then I reinstalled the driver for my EVGA UV Plus 19 (most current drivers) and bingo problem back. Uninstall. Problem gone. I'm now using mini display port to DVI for one monitor and HDMI for the other I think the machine is a bit warmer this way (versus using a USB to the EVGA device) but at least it's not sleeping all the time. Someone might say "it (the heat) is your imagination" or something else. Or someone might say "use the other thunderbolt port for another mini-display port to DVI" but I need that for the LAN... c'est la vie.
Maybe I'll write to evga and see what they say. Maybe they'll fix their driver and/or Apple will fix it.

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

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