My G5 powers on but shuts off during boot

When I power on the computer it starts to boot but then shuts down. When I unplug the harddrive and power on the computer it stays on but a folder with a question mark flashes on the screen. Totally new to mac so im hoping someone can give me some ideas to try.

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Aspire One D255 monitor shuts off during boot

Every time I boot, immediately after the kernel lauches init, my screen powers off. About 15 seconds later, it comes back on.
The delay before coming back on seems to be independent of the init process. If I speed init up, by the time it comes back on it's waiting at the login prompt. If I slow it down, it comes back on while init is still running.
I tried adding an echo -e -n '\033[13]' to my init scripts in an effort to unblank the display, but it doesn't help.
This happens both booting of the install image and after installation. It makes it extremely hard to figure out what's going on during startup.
Has anyone seen this before?

I have a similar issue with my aspire one, but the display is not turning off, it is actually the backlight turning off during boot. I use fbsplash with a dark theme but a bright progress bar. During boot, it appears as if the screen has turned off, but looking closely, I can still see the progress bar.
I have tried several different methods of keeping the backlight on to no avail.
Personally I am thinking it is monitor signal detection during a monitor mode reset during boot, ie from console resolution switching to KMS resolution. Most monitors lose signal detection when changing mode (in my experience). Some display a "No Signal" message of some sort, some briefly turn off until signal is detected again, and in the Aspire One case, the backlight turns off. Put it down to monitor manufacturers built in power saving "features".
Tha same thing happens when I boot windows.
Of course, if anyone does come up with a solution, I am eagerly listening!
Cheers.

Macbook powers on than shuts off immediately booting from battery.

Hello guys and gals,
Ok my problem on my Core 2 duo 2.16ghz macbook pro is:
When i try to boot from my battery, it turns on for like 2 seconds than turns off.
Booting from my adapter, it runs just fine it charges the battery and everything. When its fully booted, and i go to uplug the magsafe connector the computer powers off immediately.
however i did find a semi-cure, with the macbook completely off running on battery only i hit and hold the power button until it gives a long beep than it will run fine. I can restart it to without a problem.
When i shut down, the problem occurs again. Please any help will be grand.

I actually have access to 2 macbook pros. I pretty much ruled out the battery by swapping them and they both work fine on the other one. The macbook is a 15"
but here are the specs:
Battery Information:
Model Information:
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 219
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 3014
Health Information:
Cycle count: 63
Condition: Check Battery
Battery Installed: Yes
Amperage (mA): 1767
Voltage (mV): 11629
Message was edited by: Mr.Rabbit87

Mac Mini Shutting off during boot

Hello Everyone - hope I can get some help on this..
I've got an Intel-based Mac Mini, which suddenly (after changing the video resolution - at least that's the last thing I did before this changed), boots to the Apple logo, with the spinning logo underneath.. This then spins for about 30 seconds (normal time), and then the Mac Mini shuts off..
I've reset the SMC and PMU, but no joy..
Help!
Thanks in advance!
SB

Did a full reinstall of Leopard - that seems to have fixed the issue.. A smidge draconian, but effective nonetheless...

IBook G3 (A1005) Shuts off during boot

I recently purchase a used iBook G3 (model A1005) from someone on eBay. I was hoping to set it up for my wife. However, it doesn't fully boot up. The battery lights show that it holds a charge, power cable appears to work. It starts up, makes the nice sound, goes to the Apple logo and spinning dial...but then it shuts off. I am kind of new to Macs so any help would be appreciated.

Does it have a DVD-capable optical drive? Most (but not quite all) Tiger install discs were DVDs.
Ideally, you need both the original system CDs as well as the retail Tiger install disc.
I wouldn't buy any discs for it until you determine if that would have a chance of doing you some good.
Will it start up in _Safe Mode_?

Macbook Pro Lion shuts off during boot up

I have a 13" MacBook Pro purchased in 2011. I had the internet lock up on me and hard shut down the computer. Now when I press the power button, the machine begins to boot up and the apple pops up then the progress bar pops up and the wheels starts to spin, but the machine shuts down about 5 seconds into it.
I have seen this problem on older posts (pre-Lion) and one solution was to hold option during start-up and then boot off th esystem restore disc, but Lion is all internet based, so no disc here. When I do that, it pops the option to select an internet source, which I do, then the HD symbol pops up with an arrow below it. When I clikc the arrow (which is the only apparent option) it does the same thing and shhuts off at the same point.
HELP!

Try booting with command-R. This will boot into the repair parttion. From here you can run disk utility and other programs. You can also do a repair installation of Lion which will almost certainly solve the problem. Doing so shouldn't wipe out your user data, but installing OS updates will be required.

Why does My Mac Book Pro Keeps Shutting Off During Boot Up.

I recently installed office 2008 shut laptop off to take to work then i went to reboot at work and it goes to white apple screen then shuts right off,i went into disk utility and Invalid Key Length then it says the volume apps could not be verified completely. Error this disk needs to be repaired. This is like third time happen .i dont understand and no i didnt do a backup cause its a mac,never had this problem before until upgraded to lion,please help i dont wanna have to reinstall i finally got a my music from itunes,

I am afraid that you have no choice other than Repairing Disk using Recovery HD.
You can download music purchased from iTunes again for free, in case it is lost.
Best.

Battery shows over half charge then shuts off during use.

iPhone 5 w ios7 shows over half charge in battery but shuts off during use listening to pod cast for example. When placed on the charger it takes a couple of minutes then shows over half charged again. What's wrong?

Hi
If you have tried restoring and all the possible fixes you are still well within your warranty period book a genius appointment and they will offer you a repair or replacement.
Hope this helps

Macbook shuts off on boot

macbook shuts off during boot after about 15 seconds. During boot at Apple logo, during a fsck process in safe mode, during a boot into Diskwarrior CD, even during a boot into Leopard install DVD. I am a decades mac user and have never had this problem. Tried zapping the pram, tried resetting system management controller (2 diff. ways). 10.5.8 was just installed, but i don't believe this was an issue. I believe it's hardware related. Any ideas?

Hi,
I am having problem with my macbook for like a month now. I is constantly shutting off when I start the pc or sometimes while I am using it. Would you know what the problem is. I tried to update software and it seems better for a bit, then it started again. Do you think the geek squad at Best buy would be able to fix it.
Thank you very much.

I tried to restore my iphone 5s but it shut off during the restore and wont turn back on I tried reseting it with the home and power button but it doesnt work and I tried connecting it to itunes but it doesnt show up

I tried to restore my iphone 5s but it shut off during the restore and wont turn back on I tried reseting it with the home and power button but it doesnt work and I tried connecting it to itunes but it doesnt show up

Did you try to connect in recovery mode, as explained in this article?
If you can't update or restore your iOS device
If this does not work, get it checked by an Authorized Apple Service Provider or by Apple:
iPhone - Contact Support - Apple Support

Laptop shut off during hard drive reset

My laptop shut off during a hard drive reset and now it says to do a system reset but I don't know what to do

Sure sounds like a hardware problem to me. To verify that you would need to attempt to restore the hard disk to its original out-of-the-box contents using Toshiba recovery media.
If you failed to create it, you can obtain it from Toshiba. Scroll down to Get Recovery Media here.
For instructions, see the section Restoring from recovery media, which begins on p. 57 of the User's Guide.
Satellite/Satellite Pro C800/L800/S800 Series User’s Guide
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PowerMac shuts off during bootup

This morning I woke up to find that my G5 tower was powering off during boot ups. It would turn on the, I'd hear the apple chime, the fans would start, nothing out of the ordinary, then the gray screen with the apple logo would pop on screen as per usual, but then a second or two later I'd hear the "click" that comes just before I'd turn off my computer coming on when I didn't turn it off.
I've turned on the computer 2 more times and the same result. It turns off at the exact same place everytime. No sooner, no later.
My Power Mac G5 is the last model made just before the Intel upgrade. I made no software or hardware changes recently that preceded this issue. I pressed the SMU button to no effect.
Suggestions?

Been there, done that (see thread link at the bottom). Here's my initial suggestion mix for this problem.
Have you tried a Safe Boot (hold down the shift key while booting)? If it comes up in Safe mode, then I would suspect a power-supply issue, but that requires a little more troubleshooting.
If you do get it up in Safe mode, look at your system log file using Console. (Click the Logs button which will reveal more log files.) Look for a log entry along the lines of (you have a later machine and are running Leopard, so the nomenclature might be different):
*localhost kernel[0]: ApplePMU::PMU forced shutdown, cause = -122*
Now, where to go from there assuming you start up Safe OK. What is probably happening is the machine is probably executing a test in the normal startup that is "flexing" as it were the power supply, which is not responding quite like the SMU expects. This may be caused by something as simple as dust accumulation in the power supply. The G5 supplies can build up a considerable amount of dust, which needs to be blown out. This might be able to be done with canned air, realizing that you will stir up a bunch of dust, so it should be done outside somewhere.
Also, you can get more info by doing the verbose boot, holding down the command-V combination when powering up. You will get a dumb terminal display of what is going on. This will verify at least that it is truly powering down at the same place in the boot. There are three ways to set verbose boot as a default for the machine, should you decide to do this.
Method one requires using terminal (you can do it after safe boot) and using the following unix command:
*sudo nvram boot-args="-v"*
You can also use open firmware, in the following manner
*set-env boot-args -v*
Or you can boot single-user mode (command-S at boot, then issue the terminal command above without the sudo, which is unnecessary in single-user mode.
I just went through a similar situation a month ago, see http://discussions.apple.com/thread.jspa?threadID=2452255&start=0&tstart=0 and I ended up replacing my power supply, though the dust blowout might have worked as well.

Nano with Nike + shuts off during run

In addition to the "activity stopped" issue which is driving me crazy, now my nano (2nd gen) just shuts off during the middle of a run. Not a battery issue. When I press a button, it comes back on.
All of a sudden this is happening and is driving me nuts. Is my receiver defective? It's not a sweat issue, as I wear a belt clip.
As for loosening, I always wondered by the Nike receiver doesn't have two little clips that secure the receiver to the nano, like the syncing cables.

Hello
I am having the same problem too! About halfway through my 4 mile run, a voice over comes on and tells me that my activity has stopped. This continues for the rest of the run about every 5 - 7 minutes. Because of this, my 4 mile run only logs as a VERY SLOW 2 mile run.
What can I do to fix this problem? The plugin is not loose and my IPOD is not giving me a reading that the battery in my shoe sensor is dying. I can't call for technical support because it is past the 90 day purchase, but I haven't even had the Nike+Ipod for an entire year yet! PLEASE HELP!
Unlike the original posting, my IPOD does not shut off - so I know it is not an IPOD issue but instead a Nike+IPOD issue....

Maybe its just me but verizon had my rebate for a month and some change and still haven gotten it i got this contract on july 10, and my samsunsung galaxy s4 does nothing but shut off on me constatntly and they wont even help..any suggestions because im

maybe its just me but verizon had my rebate for a month and some change and still haven gotten it i got this contract on july 10, and my samsunsung galaxy s4 does nothing but shut off on me constatntly and they wont even help..any suggestions because im looking into a lawsuit now so aggravating..my phone is def on a blank sceen right now

JCLouis,
We saw your story and are very worried about what we read! This isn't like us at all and we are here to help sort it all out. We recommend calling the Rebate Center to check on the status. Their number is 1-800-457-0864.
We can help you right here with your phone! How often does it turn off? Is it just that the screen goes black or does it completely power down? Also, does it start back up by itself if it does power down?
SarahO_VZW
Follow us on Twitter @VZWSupport

My IPhone 3GS JailBroken turns on but shuts off then the black background comes up with white apple logo? And then turns on again? Does it over and over! HELP!

My IPhone 3GS JailBroken turns on but shuts off then the black background comes up with white apple logo? And then turns on again? Does it over and over! HELP! Why Does This Happen And Is This Repairable?
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Ryan Crawt
[email protected]

Its against the forum TOS to talk about J/B phones. you will have to use google to resolve your issue.

My G5 powers on but shuts off during boot

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