HT3205 mac going into sleep mode for no reason

my mac is playing up. Every time I open it, the screen will appear briefly then flash off as if I have put it on sleep mode. When I close the top and re-open it it does the same thing again, sometimes it works for a while, but will turn itself off again after a few mintues.
I have tried charging it, turning it off etc and nothing seems to be working. Does anyone know what this means and could help me please?

Problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset:
Resetting the System Management Controller (SMC)
Resetting the SMC on Mac portables with a battery you can remove
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery (to remove the battery - click here: MacBook or MacBook Pro).
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.
Resetting the SMC on portables with a battery you should not remove on your own
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.

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Mac goes into sleep mode amd doesnt come out!!!!!!!

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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.

My Mac goes into sleep mode while playing videos or DVDs.

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Welcome to Discussions - the problem is probably overheating, which causes your computer to sleep. Look in you Applications>Utilities>Console and see if your System log shows "maximum temperature exceeded for 30 seconds". This would indicate a problem with your Power Supply Unit or a faulty temperature sensor. You should take it in to be looked at.

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Mac goes into sleep mode

A few months ago I was had a problem where my Mac was overheating. The geniuses over at the Apple Store told me to put a fan behind it and call it fixed. The error I was getting back then said that there was something wrong with the heat sensor. My Mac shuts down, but the console gives me this now:
Sep 15 20:00:03 Stephanies-iMac mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Sep 15 20:00:11 Stephanies-iMac mDNSResponder: Repeated transitions for interface en1 (192.168.2.2); delaying packets by 5 seconds
DeviceAddedCallback(): iterator=2203, retain count=2
device ae07 (PTZ-430) found.
Sep 15 20:01:02 Stephanies-iMac mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Sep 15 20:01:07 Stephanies-iMac mDNSResponder: Repeated transitions for interface en1 (FE80:0000:0000:0000:0214:51FF:FE84:667C); delaying packets by 5 seconds
Sep 15 20:01:09 Stephanies-iMac mDNSResponder: Repeated transitions for interface en1 (192.168.2.2); delaying packets by 5 seconds
I can't afford to pay another $80 for nothing, especially since I'm upgrading in February. It stopped for a new days after I installed a security update. It's gone into hibernate 4 times since I started this post. HELP!

Although mine is not over-heating (I don't think) my mac has just recently started to "go to sleep"... I would have posted my own post but your title describes what is happening to me!
This is the post I made to the Using Tiger forum:
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.

Late 2012 Mac mini with OSX 10.8.2 has started shutting down instead of going into sleep mode.

Sometime in the last week or so my mac mini has started going into full shut down instead of sleep mode.
I have tried checking and unchecking energy saver boxes but haven't found anything which will get me back to where I used to be - and I haven't knowingly changed anything to make this happen.- maybe an OS update caused it?
The machine will fire up with a tablet click rather than needing the reset button to be pushed so clearly the machine is sort of halfway between sleep and full 'off'. Most frustrating as one of the key issues for me in getting this my first mac was its easy sleep and super quick fire up compared to windows.
Any help appreciated
Oh yes I just remembered that I did just install 2 8gb of crucial RAM (to replace the supplied 2 2gb but surely that can't have anything to do with it - can it)?

Adding to my first post I can now advise that when the mac goes into sleep mode the light on the front stays on (it does not pulse so clearly it is not really sleeping).
When i click the tablet / keyboard this is actually what triggers the mac to reboot
I have tried resetting the SMC as per the following link to no avail
http://macs.about.com/od/usingyourmac/qt/Resetting-The-Smc-System-Management-Con troller-On-Your-Mac.htm
Help please!

Mac Tower Pro 10.8.5 keeps going into sleep mode

Purchased from Apple, refurbished 2012 Mac Tower Pro. At the same time, purchased a new Dell U2713HM, 27" monitor.
Have been operating on this new system since about the first week of December 2013.
Issue:
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.
This has caused much frustration because when it goes into auto sleep mode, it quits all programs that I am in, and when it does this, I lose all the work I had accomplished. It litterally closes everything and goes to sleep in about 2-3 minutes of no activity.
BTW: the computer and monitor have all its new OEM cables that came in the box, when I purchased the units.
Solutions attempted:
System Preferences — Energy Saver: computer sleep and display sleep set to "never" and unclicked the box "Put hard disks to sleep when possible."
Dell settings: Turned off all energy savers.
Results:
Nothing. Problem persists.

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:
1. Go to System Preferences.
2. Click on Security and Privacy.
3. Click on Advanced (bottom right corner)
4. If the first line is checked (Log out after 5 minutes of inactivity); uncheck it and then click OK button.
5. Be sure to click the lock before existing Security and Privacy.
Now the machine will cease shutting down programs to go into sleep mode as soon as machine is inactive for a few minutes.

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.

My macbook boots up and only stays on for 30sec and goes into sleep mode

My macbook boots up and only stays on for 30sec and goes into sleep mode! Any suggestions as to why this might be happening? Thanks....

I assume you have checked your sleep settings in System Preferences>Energy saver
I also assume this has just happened recently and spontaneously, not after installing any particular hardware or software or you would probably have mentioned it...if anything new has been added recently, obviously just remove it!
It could be the battery - have your tried it just on mains? If it's a pre unibody MacBook try it without the battery at all. This could happen if you have a non-Apple (cheap Chinese) replacement battery.
Try NVRAM, PRAM & SMC resets (Google if you don't know how)
Try booting from the install media and repairing or reinstalling OS X. (Back up first!)
Just out of interest if you boot from a DVD or go into Open Firmware or Boot Select modes, does it still sleep after 30 seconds or is it just in OS X?

Unexpectedly goes into Sleep Mode... All the time!

I've had this Powerbook for about 2 years now, and I've got some problems. About every 5 or 10 minutes, it goes into sleep mode! It acts as if I close the screen, so I wake it up by pressing the spacebar. But sometimes... pressing the space bar doesn't wake it up, not even holding the power button turns it off! I have to remove the battery to restart it! Can someone help please?
By the way, I checked "Power Save" settings in System Prefs and everything seems to be correct.

If you have issues with a Mac or display that goes to sleep at inappropriate times, you may have a problem with Energy Saver. Delete the following .plist files and restart:
-/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
-/Users/username/Library/Preferences/com.apple.systemuiserver.plist--
(username is your name or System Administrators name)
-/Library/Preferences/SystemConfiguration/com.apple.AutoWake.plist
A restart is very important after deleting these plists. After a reboot your Mac will then generate new ones.
Some, in these forums, have had luck fixing sleep issues downloading the Combo update from this site (yours may be corrupt), not Software Update, disconnect all firewire + USB devices except keyboard + mouse, Repair Permissions, re-install update, Repair Permissions again + try.
Yours would be the 10.4.7 Combo update. Others reading, download the combo update that applies to you!
Cheers!
DALE

Updated to windows 10 and now my computer stays black when it goes into sleep mode

I just updated my computer to windows 10. Whenever it goes into sleep mode and i try to move the mouse it just stays black and i have to turn my computer off and then on again. after that it finally works but its just annoying. I already tried updating my card driver, but it said it was already up to date.

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.

Week old IMac G5, Version 10.5.2, goes into "sleep" mode randomly....

My sister has a brand new IMac G5, OS X version 10.5.2, the screen randomly will go black, it still stays on, it's like it goes into sleep mode, but force quit wont work, nothing works, restart is required in order to get out of it.
On another note, when she restarts the computer, and sometimes when she's just starting it up not on a restart, the computer will have colored lines running down the whole screen, when it gets to the blue loading screen, it freezes there, where once again it requires a restart. Problem is, the computer is less than TWO WEEKS OLD. I've had my mac for years and cant figure out the problem, anyone that knows of, or has had similar problems and had them fixed that could help out would be nice. Thanks!

In fact, what your sister has is an intel iMac, not a G5, those were discontinued a couple of years ago. She has telephone support for 90 days and should call Apple immediately for a solution to her problem.

G5 spontaneously goes into sleep mode

Suddenly in the last couple of days my G5 has been spontaneously going into sleep mode. Sometimes within 5-10 seconds after "waking" it (which involves simply hitting the space bar) and several times in a row. It doesn't seem to matter what program is open or what I am doing.
My settings are set for sleep after 3hrs for the computer and 1.5 hrs for the display (which is a 20" apple cinema).
I do have a WD 500GB external HD (800 firewire) hooked up to the apple installed FW port (not an additional PCI slot). I did reformat it for Mac and partitioned it (2 volumes). It has been seemingly working fine. It does tend to go to sleep so not sure if it is putting the computer to sleep?
I did vacuum our the intake and outtake to no avail. It does seem to be staying awake since unmounting the HD.
could this be the cause? Any and all advice welcome. thanks.

yes, and to the best of my limited ability to make heads or tails of them, it says fans are normal and that the temp seems to be normal. Here is a portion of what it said leading up to my last sleep:
Aug 9 15:28:41 MI6-2 kernel[0]: [13] "CPU A AD7417 AD1" Type:"temperature" Id:11 CUR:46.45266 C
Aug 9 15:28:41 MI6-2 kernel[0]: [14] "CPU A AD7417 AMB" Type:"temperature" Id:10 CUR:38.16384 C
Aug 9 15:28:41 MI6-2 kernel[0]: [15] "CPU A AD7417 AD2" Type:"current" Id:12 CUR:4.46656 A
Aug 9 15:28:41 MI6-2 kernel[0]: [16] "MLB MAX6690 AMB" Type:"temperature" Id:8 CUR:37.32768 C
Aug 9 15:28:41 MI6-2 kernel[0]: [17] "SLOT 12V" Type:"power" Id:20480 CUR:0.0 W
Aug 9 15:28:41 MI6-2 kernel[0]: [18] "SLOT 3.3V" Type:"power" Id:20992 CUR:0.0 W
Aug 9 15:28:41 MI6-2 kernel[0]: [19] "SLOT 5V" Type:"power" Id:20736 CUR:0.0 W
Aug 9 15:28:41 MI6-2 kernel[0]: USBF: 3044.623 AppleUSBOHCI[0x3809000] Processing WDH before suspending
Aug 9 15:28:41 MI6-2 kernel[0]: IOUSBWorkLoop::closeGate - interrupt Thread being held off[20] "SLOT COMBINED" Type:"power" Id:21248 CUR:6.40345 W
Aug 9 15:28:41 MI6-2 kernel[0]: IOHWCtrlLoops:
Aug 9 15:28:41 MI6-2 kernel[0]: [0] "Clock Slew" Id:0 MetaState:0 "Dynamic Power Step"
Aug 9 15:28:41 MI6-2 kernel[0]: [1] "Drive Bay Fan" Id:1 MetaState:0 "Normal"
Aug 9 15:28:41 MI6-2 kernel[0]: [2] "CPU A Fans" Id:2 MetaState:0
Aug 9 15:28:41 MI6-2 kernel[0]: [3] "CPU B Fans" Id:3 MetaState:0
Aug 9 15:28:41 MI6-2 kernel[0]: [4] "U3/Backside Fan" Id:4 MetaState:0 "Normal"
Aug 9 15:28:41 MI6-2 kernel[0]: [5] "PCI Slot Fan" Id:5 MetaState:0 "Normal"
Aug 9 15:28:41 MI6-2 kernel[0]: ---------------------------------
Aug 9 15:28:47 MI6-2 kernel[0]: System Sleep
Aug 9 15:28:47 MI6-2 kernel[0]: System Wake
I am at a loss here. thanks

Continuously goes into sleep mode

my computer worked perfectly fine until the day in literally blew up from the logic board b.s. ... so i got it replaced probably like back in febuary and have nothing but problems since and when i bring in to apple they cant do jack about it.
my fans run excessivly and the computer will start to go into sleep mode after being on for maybe 30 mins and then just keep doing it right when i start it back up. has anyone else had this problem?!?!?!

I too am having the same problem with my G5 going into sleep mode, although I must be lucky because I get about ah hour out of it before it shuts down. The problem appeared after replacing a logic board with blown capacitors at an approved service center. Since then they have also replaced the power supply and it is in shop now getting it's third logic board?!*@#! I do have to admit though that apple has coverd the cost of all repairs so far in spite of expired warranty.
All those MAC commercials are driving me crazy... "Hi, I'm a mac. Hi, I'm a PC. Neither of us work, but at least it's fairly easy to fix a PC."
Is there a point dealing with apple through phone directly or is going through a service center just as good?
iMac Mac OS X (10.3.7)

MacBook goes into Sleep Mode w/o me telling it to

An iPod-like image pops onto my screen with "Zzzz" coming out of it. Then my computer goes into sleep mode.
This has happened a couple times. Once, I did not have it plugged in. The other time (just now), it was plugged in. Neither time was my battery even close to low power. Neither time did I come close to touching something that would put the Mac to sleep. I have checked my power settings, and they are all correct. For instance, I have the power/screen not shutting off when it is plugged in.
Any ideas???

Got the exact same problem here - I have it plugged into power and my on-power setting says "never sleep" and yet keeps trying to go to sleep (actually I think it is shutdown) when I leave it alone for a hour or two. Most of the time I have stuff running that it can't close automatically so I come back to a window full off dialogs asking for quit confirmation.
Very irritating - is my Mac just trying to be green? Is it somehow thinking its in battery mode? Is there some more obscure setting that will prevent this?
Or is it just a bug...

HT3205 mac going into sleep mode for no reason

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