IMac power problems?

Sinse upgrading to Snow Leopard, I've been having some power issues with my iMac. First, during the night and day, usually when it is idle and in sleep mode, it will wake up on its own. However, it does not turn on the display. THe fans will run, the hard drives clicks, in the same pattern as it does when usually waking up, but the screen remains off. For about 10 to 15 seconds after wake-up, the hard drive will go mad crazy as it seems to seek the hard drive, then go back into sleep mode. I have no idea why it does this; I do not believe it is the "Wake for Network Access" feature because this is disabled.
Another problem it has is that it will just randomly shut off. That simple. As if I pulled the power cord, it simply turns off. WIthout closing Finder and the Dock first. It just simply dies. Loosing whatever I haven't saved.
Anyone else having issues with their macs and snow leopard?
(I am using a iMa7,1. Obviously a much older aluminum iMac.)

I fresh installed Snow Leopard 3 days ago on my mid-2007 24" iMac. Once, the machine went into sleep mode and would not wake no matter what I did. Finally I held the power button until the machine turned off and then powered it up again.
Then last night even more disturbingly I put it in sleep mode and when I went to wake it this morning... nothing. But this time the machine was dead. No matter how long I held the power button in there was no response. I could hear neither fans nor power supply. I did an SMC reset and the first two tries nothing happened. Then for whatever reason, on a 3rd SMC reset the machine responded normally to the power button and has been running since.
I am very much HOPING this is a Snow Leopard issue since the alternative may be a failing power supply. I just got this machine back from Apple Service last week for replacement of a failed hard disk.
If anyone else has information regarding Snow Leopard power issues or other suggestions I'd love to hear them.

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Intel iMac Power / Overheat issue?

Hi there,
I have an Intel iMac from 2006. About 2 years ago it started to just turn itself off randomly as if there was a power failure. When it does, the only way to power it back up is to switch it off at the plug, switch it back on and press the power button (strangely) twice. I have noticed it seems to be temperature related - when my iMac reaches around 78C (which I'm pretty sure it should be able to handle fine?) it tends to be in the danger zone and at any minute can switch itself off.
I've got around this by using smcFan Control - which thankfully displays the temperature in the menu bar meaning when I hit around 72C I can whack the fans up to full blast to keep the temperature down. Being a sound studio computer - the hum of the fans really isn't ideal, but it at least makes my computer usable. However, I'm currently in the middle of a big project on Logic and I've had to turn my room into a fridge (window open-more clothes on) to be able to work on it as all the processing involved heats it up to 75C+ in no time.
I was hoping someone could shed some light on this or at least tell me if I am right in thinking that 78C is nothing really and the iMac should deal with it easily.
I have seen tons of posts regarding the G5 iMac power problems and similar problems with the intel iMacs - I've done all the hardware resets (PRAM, SMC, PMU) as suggested in these forums but nothing has helped.
I have had the power supply changed in the past (before this problem arose) as one day it just went kaput. Don't know if that makes any difference but I'm pretty sure that the problem started a little while after the replacement was installed.
Thanks in advance!
Message was edited by: Lee_Head

LR is a Universal Binary app. YOu're good to go. I did a migration from iBook to MacBook recently with no issues.
Don
Don Ricklin, MacBook 1.83Ghz Duo 2 Core running 10.4.9 & Win XP, Pentax *ist D
http://donricklin.blogspot.com/

Have an iMac. Problem is I hear the fan noise, yet no power on the screen yielding no power. I have checked the power cord and it seems to be fine. Not sure if computer is a total loss. What would be the next step?

Have an iMac. Problem is I hear the fan noise, yet no power on the screen yielding no power. I have checked the power cord and it seems to be fine. Not sure if computer is a total loss. What would be the next step?
<Email Edited by Host>

What does the EMC# say on the base?

27" iMac power cord vs 20" power cord???

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Reason why I'm asking is because my new 27" iMac i7 randomly shuts down with no warning. I searched and found out that this has happened to others as well. Supposedly resetting the SMC will help but it did not for me. Last time it did it I heard a faint click right before it shut down, first three times it did not do that. I've lost hours of work and am really ticked off. I have a new machine on the way and hope its an isolated problem. I'm running latest OSX with all updates.

Won't matter a bit. There is absolutely nothing special about those cables except the little bit of plastic that makes it sit flush with the rest of the case when plugged in. You could steal an AC cable from an old PC if you wanted, wouldn't make a bit of difference.

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Quit the game and restart the iPad.
To quit the game - Go to the home screen first by tapping the home button. Quit/close open apps by double tapping the home button and the task bar will appear with all of you recent/open apps displayed at the bottom. Tap and hold down on any app icon until it begins to wiggle. Tap the minus sign in the upper left corner to close the apps. Restart the iPad. Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.
If that doesn't work try this.
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Hi and Welcome,
On my old G5 when I saw the red light through the front grill it meant that the machine was not going to boot. I just turned it off in the front, a hard shutdown, when I saw it. For me, I was able to wait for for a while and usually it would start up with no trouble again. But that Mac also had heat issues and sometimes running a small fan through the grill would allow me to start up sooner.
One thing that might be adding to your problem might be the amount of RAM you have, it's a very small amount.
Is your Hard Drive almost full? That can be a problem.
Can you start from one of the OS disks and use the app Disk Utility?
If you have the Discs that came with the Mac (originally), on one should be The Apple Hardware Test. That might help you diagnose the issue.
A PMU reset might get you started again. It's a bit model specific, for some it's just pulling the cord out (sound familiar?) and that resets the NVRAM. For other models this is a good reference: http://support.apple.com/kb/HT1436
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My MacBook Pro is exhibiting power problems. I am running Yosemite and it seems that the problem may have arisen since I dowloaded this upgrade. When the battery is charged it shows 99% charge and I can use it on battery power. As normal with use the charge gradually reduces, say to 30%. I then switch off using either the on/off button/apple logo, waiting for the dialogue box, " do you want to switch off etc". The next day, I switch on, but the computer will only boot up when the power lead is attached. When the computer comes on, usually as normal, the charge always shows 0%. When it is recharged the whole process repeats itself. Help please.

Hi,
Thanks for responding. My MBP is late 2009 and the battery has never been replaced. When I look at battery condition, it registers as normal, as it does when I do the power checks you suggested. When I plug in the power cord it glows green and within a few seconds it is on amber, until fully charged. I've done the SMC reset. I noticed this morning that after using it last night the battery capacity was 93% and an expected duration of about 5.5 hours was listed. After limited use this morning, restricted to email admin only, the charge level had dropped to 88%, but the predicted duration was only 2.75 hours. Currently the level is 73% and the duration is 3 hours, although I have accessed the web several times. Presumably there is some sort of algorithm that looks at current usage and predicts the duration. I will continue to monitor this to see what happens. In the meantime if you have any more thoughts!!!
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cornelius

Power Problems - MacBook Pro

My MacBook Pro is exhibiting power problems. I am running Yosemite and it seems that the problem may have arisen since I dowloaded this upgrade. When the battery is charged it shows 99% charge and I can use it on battery power. As normal with use the charge gradually reduces, say to 30%. I then switch off using either the on/off button/apple logo, waiting for the dialogue box, " do you want to switch off etc". The next day, I switch on, but the computer will only boot up when the power lead is attached. When the computer comes on, usually as normal, the charge always shows 0%. When it is recharged the whole process repeats itself. Help please.

Howdy rcoo26,
It sounds like there’s an issue turning your MacBook Pro on when it isn’t connected to power, and the battery doesn’t seem to be holding a charge. The article below provides information that can help you troubleshoot the battery in your notebook.
Mac notebooks: All about batteries - Apple Support
If there isn’t an issue with the battery, try the general troubleshooting tips in this article:
If your Mac won't turn on - Apple Support
Cheers,
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My bookmarks are lost after turning off the computer unexpectedly (power problem),how can it recovers?

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我的书签在电脑突然被断电之后全部丢失了，我该怎么办呢？？谢谢啦！！~~~~

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Details as follows:
this is a recent problem in the last 3 weeks
the problem occurs with all three Canon batteries that I use
from time to time when the power is on, the camera suddenly loses all power and displays an “empty” battery image
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Since coming back from a trip, while transferring images from the camera to my computer, I noticed that the (almost) full battery started showing “empty”.
The transfer was completed successfully, and when the camera was disconnected from the computer, the battery showed that it had lots of charge left. Very puzzling!

It sounds like either the battery terminals aren't getting a solid contact or there's a fault (something loose or grounding out) inside the camera. But if something were genuinely loose or grounding out inside the camera, then power cycling or even re-inserting batteries would probably not fix it -- which makes me suspect it's still something outside the camera.
Are any of the batteries new, or are they all about the same age as the camera?
Batteries only last a few years but it'll depend on how they were used. In other words if all three were used about the same and enough charge cycles to be at the end of their reliable life... it might be time to replace them.
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Nope! As Rick Lang noted, Apple provides "Migration Assistant" with OS X - when you get your new iMac, and go through the setup at power-on, you'll eventually be presented with a "Migration Assistant". To migrate from your G5, it's as simple as connecting the G5 to your iMac via a FireWire cable (You may need a FireWire 800 cable for new iMacs - also called a "9-pin to 9-pin" firewire or IEEE 1394 cable. Shop around - most retail stores, like Best Buy, charge way too much for cables). Then, startup the G5, holding the "T" key. It'll enter "FireWire Target Mode", acting as an external hard drive. Migration assistant while then happily copy all your user data to the iMac - it may take a while. If you've already setup the iMac, you can still use the Migration Assistant - it's in the "Applications>Utilities" folder.
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IMac power problems?

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