Just got my mothers 21 in. iMac on Snow Leopard back from Apple last wednesday. They replaced the logic board and powersupply because it was shutting down by itself and only part way. Power still on the USB. When we got it back, noticed we could hear the fans and the system was much cooler. Seems to be working OK, but yesterday, I manually put it into sleep mode. It normally runs all the time, just puts the display to sleep. The fans shut down and the screen went black. So far so good. Then I clicked on the mouse to wake it. OK, but then in about 2 minutes, it went to sleep again. Every time I woke it, it went back to sleep. Had to do a restart to make it work normally again and stay on.
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.Â
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./private/var/log/kernel.log says "Previous Sleep Cause: -100"
Info: iMac (24-inch Early 2009), Mac OS X (10.7.3)
I set my iMac to go to sleep after 15 minutes of inactivity. Everything worked as it should until I updated Lion to 10.7.3. Now it seems that iMac never goes to sleep on its own. No new hardware installed whatsoever, every settings are the same as before. I even tried by not running any programs, and it still won't go to sleep unless I force it to. It's a mid-2011 iMac with core i5.
Under the apple menu, choosing sleeo mode, screen goes black, power to back up drive and ubs pors still on. When I reawake airport still active along with everything else. 10.7.3 3.06 Early 2009
Found this issue on many forums, but unfortunately I cannot find a solution. Taking to an apple store for repair is not an option. If I'm going to spend $300-$400 for repair, I might as well purchase a new PC. I am not that attached to this mac, and now with operating issues, I'm even less so. At least with a PC I can ctrl+alt-del and start all over. I was expecting more than 4 years out of a $1200 imac, so if I have to replace repair every few years, I'm thinking I'd rather start with a clean slate for $400 every few years with a new PC. Very frustrated not being able to find a solution online about this problem, seeing that it seems so common.Â
While working on imac and surfing the net, my screen will intermittently go to sleep. I can wiggle the mouse and click it and it will come back on right where I left off, internet connection and all. Once it happens, it continues to happen until I shut down and walk away for a good length of time (overnight). Problem seems to happen when the imac has been running for many hours at a time. I have set up the activity monitor, but I don't know what the numbers mean or what to look for. Â
This initially started happening this past summer, and I thought it was a heat issue, but now that it's happening mid-winter, not so sure. Also, in the summer this seemed to be prompted by streaming online, but now it is just from surfing. Not sure if it would shut down if I was working in Pages or Numbers, as I do so infrequently. Doesn't matter if it's Safari or Firefox and it's not a hot corners/sleep issue. Also noticed my fan runs loud sometimes, but not always. Not sure if it's a related problem. Does not sleep because of fan, no consistency in shutting down, etc.Â
When logging out my I Mac often dont react. It will stay open, or it will sometimes react as it sleep. When I open the Mac again the screen is still warm.
My iMAC has suddenly decided it will not go into the sleep mode without any enforced changes to my preferences, which are set for the system to sleep after 15mins of inactivity. Now the screensaver kicks in and the computer screen is on all the time.
Every few months, my iMac will start up from sleep mode on its own. Why does it do this, and is it something to be worried about? i am not touching the mouse or keyboard or using any remotely connected devices when this occurs.
When my computer goes to sleep it will not wake up, and I have to shut down using the power button on the back and then restart. I called support and they advised me that this only happened when the computer went to sleep on it's opwn but not when you manually put it to sleep, But that proved not to be true. It will not wake up under either situation? The support persontold me to logonto applke and re-install the sytem software which I have done but that did not cure the problem either. I have my preference set to never sleep. I am ar]t a loss as to what to do now as when it goes to sleep or I put it to sleep i sometimes will not start up even after shutting down and restarting.I am on 10.7.2?
For the last few days, since carrying out a software update (dont know what update!) when I select "sleep" from the main apple menu my screen goes to sleep but my hard drive keeps running, how do I correct this so the whole thing goes to sleep?
This machine will simply not go to sleep. I have wake on lan turned off, bluetooth turned off, wifi turned off. OSx Lion 10.7.3. Click finder - Sleep, Screen goes black, between 3 and 10 seconds later : machine is back on. Using Bluetooth Trackpad , Mouse and wired keyboard. Nothing else is connected to the machine (apart form an ethernet cable).
I have a 2.5Gh intel core i5. I put it to sleep last night and today when I went to turn it on it wouldn't wake up. It wouldn't respond to pushing the power button. I unplugged it and plugged it into another power outlet (both worked with other appliances). finally after about about 20 minutes I unplugged the power cord from the back of the computer. As soon as I pushed it back on the computer started booting up (without even hitting the power button). What happened? Did my power drop and this was sort of a reset for the mac?
My iMac won't start up, or wake from sleep. I've tried everything, except for reinstalling the SO-DIMM memory modules. Still, my iMac will not wake up. Turning it on, you can hear the fan run, but the display stays dark.Â
My Mac would not turn on this morning from sleep mode. I pressed the power button and nothing. Then I did it again and heard the fan shut off inside so I tried again and up it came. Also I cannot wake my Mac up unless I press the power button. I used to press any key on the keyboard or move the mouse and it would wake up, but now that doens't work. I don't know if this could be a reason, but my mother has a horrible habit of unplugging it when it storms. It's always asleep and I've told her not to do that and to make sure it's turned off before ripping the cord from the wall. But she continues to do it when it storms.
Below is what console is giving me about my iMac waking. Does anyone know what it means and what I can do to fix it?
7/1/12 4:54:06.104 AM PleaseSleep: Checking sleep conditions... 7/1/12 4:54:06.104 AM PleaseSleep: Going to sleep... 7/1/12 4:54:06.110 AM [0x0-0x13013].com.dragonone.PleaseSleep: Sleeping now... 7/1/12 4:54:06.324 AM PleaseSleep: Sleep notification received from the system 7/1/12 4:54:06.418 AM powerd: PMScheduleWakeEventChooseBest: m=0.00 s=0.00 a=0.00
Is it best to turn off my 27" i7 processor iMac or put it into sleep mode when it's not in use? ie sleep or leave the house. Also the fan has just turned on, never heard it before. I am watching a video whilst converting another into mp4 format. Is that why?Â
My iMac shut itself down last night while in sleep mode. It's rarely ever turned off. I cannot get it started today. I'm not the most tech saavy person but can follow instructions if someone could walk me through it. Â
Purchased in 2006 and has worked well until now. AppleCare has expired.
My iMac keeps shutting down in after about an hour in sleep mode. I have to press the power button to turn back on. Energy saver settings are still default settings. I'm running osx 10.7.4.Â
Info: iMac (21.5-inch Mid 2011), Mac OS X (10.7.4)
