My macbook starts but switches itself off

i turn my macbook on and it makes noise starts up had the grey screen wit the apple and has a little loading bar underneath and starts to download and then turns itself off

jchehade4,
which model MacBook Pro do you have, and which version of OS X is installed on it?

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Windows will NOT start up. Will start, BUT log itself off ASAP

I have an S10 netbook. Recently it caught a virus so I figured that the easiest thing to do was to do a system restore to an earlier time. The system restoring process went like it should; however, it wasn't successful. Once the system restarted and came to the welcoming screen, It would automatically log off as soon as the system logs on. I tried loging back on several times, but it still logs off automatically and doesn't allow for the windows to open at all. I am clueless right now. I am open to any ideas and approaches. Please feel free to ask questions to clarify or give suggestions for a possible solution. Thank you for your time and genousity.
- Jay

jayenom, welcome to the forum,
I agree with KalvinKlein, it's probable that you've caught some sort of bug Please take a look at my reply here to a member suffering the same problem.
You should be able to copy your important files from the drive, just make sure you scan them before copying them back.
Andy ______________________________________
Please remember to come back and mark the post that you feel solved your question as the solution, it earns the member + points
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HT201407 Hello All, I bought an iPhone of eBay. It seemed fine until this morning when it switched itself off and now it won't come on unless it's plugged in. And even then it is asking that it needs to be activated, but it can't connect to iTunes. Any su

Hello All, I bought an Iphone of eBay. It seemed fine until this morning when it switched itself off and now it won't come on unless it's plugged in. And even then it is asking that it needs to be activated, but it can't connect to iTunes

Try Recovery Mode... http://support.apple.com/kb/HT1808

HT5538 Hubby's phone has switched itself off and won't switch back on. It has been charged but nothing works.

Hubby's phone has switched itself off and won't switch back on. As far as we know it's fully charged, can't check as got a blank screen but does buzz when charger is plugged in. Has been left on charge for quite some time. As you will gather, I am sending this on his behalf.

A reset may help. Tap and hold the Home button and the On/Off buttons for approximately 10-15 seconds, until the Apple logo reappears. When the logo appears, release both buttons.
No content is affected by this procedure.

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My Iphone4 had a low battery. It switched itself off and I cannot get it to turn back on!
Normally when I plug it into charge i says charging but nothing!
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Hello Kenny
It sounds like that your email is associated to another Apple ID. You may want to check her Apple ID at applid.apple.com, and see if your email is linked to it.
Associating and verifying email addresses with your Apple ID
http://support.apple.com/kb/HE68
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I locked my MacBook - it switched itself off - restart it - white screen with a folder and a questionmark appearing on the screen, I can type in the password or do anything at all

I locked my MacBook with the find my iPhone app, then it switched itself off and now, when i restart it there is a white screen with a folder and a questionmark appearing on the screen, I can type in the password or do anything all. I really didn't wipe it, and in the app it says: MacBook locked toay at 15:49.
I am really desperate. Plz help me.
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Did you setup a lock code? I have done this operation via iCloud just few minutes ago and it's booted with 4 numbers lock code just fine. When you lock your Mac, it's restarts automaticly and then loads with lock screen and you are only able to enter password of 4 numbers to unlock it.

MBP switch itself off sporadically

Hello!
The short version: my MacBookPro (technical details below) switches itself off sporadically and nobody knows why!
The long story now: In July this year began my MacBookPro began to switch itself off. Due to the fact that this happened first while using Aperture 3 I thought that the problem was Aperture-related. It wasn't, the MBP did this after this first failure also while using other programs, even then, when Aperture was not open in the background.
So I started searching. First the usual things (Onyx, safe reboot, DiskWarrior, PRAM-reset), then the special ones (test with TechToolPro - everything was ok!) - but this didn't change anything: the MBP still switches itself off!
I couldn't even find a pattern: it happened after hours of use as well as shortly / during the (re)start or in battery-mode or when it was plugged in.
I made a backup of everything, wiped (secure) the harddrive, installed a new system on it, made all the system-updates and used it like this for a while. Nothing changed, it still switched itself off sometime!
I took it then to SCNet in Essen to have it repaired. They tested it for one week and found nothing! The MBP had beautiful results in all of the tests and switched itself off not even a single time - a wonderful machine, they said!
I took it back home, this wonderful machine, and used it whitout any change for a while. After some time, the nightmare began again!
Now I really don't know what to try anymore... so I'm here!
Here are the technical details about my MBP:
- MBP 17"
- built in 2007
- RAM maxed from 2 auf 4 GB by Gravis (an autorised reseller) in Essen (in 2008)
- the internal harddrive (160 GB) changed by the same Gravis in Essen through a new one (320 GB) (also in 2008)
- logic board changed by SCNet due to an NVIDIA-error (it was paid by Apple!) - I've posted about this here (http://discussions.apple.com/message.jspa?messageID=11403389#11403389) already.
- Mac OS X 10.6.4
Do you have any advice? Do you experienced something like this or at least heard of such a nightmare?
I am very grateful for any advice!
Regards,
Vlad

I took it then to SCNet in Essen to have it repaired. They tested it for one week and found nothing! The MBP had beautiful results in all of the tests and switched itself off not even a single time
When the issue occurs with you, are there any peripherals connected to your computer? If so, remove them.
Make sure you are not using the computer on your lap as it is not a laptop. Sometimes if the Macbook Pro gets too hot, it will shut itself off.
Per your user manual: Do not operate your MacBook Pro on a pillow or other soft material, as the material can block the airflow vents. Never place anything over the keyboard when operating your MacBook Pro. Never push objects into the ventilation openings.
From MacBook Pro: Care, Use, and Safety Information
If you have Apple Care, I would give them a call. Advise them what the repair shop told you. You may need to take your computer to another repair shop for a 2nd opinion.

7380 keeps switching itself off

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My phone although fully charged has just switched itself off and won't turn back on again! I'm just coming to the end of a 2 year contract and never had any problems with it. Help please!

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Start here
http://support.apple.com/kb/HT1430

HT201412 My iphone 4S switches itself off regularly. The battery is well charged,however. So I don't understand what's going on. Anybody got any idea. Thanks a lots

My 4S keeps on switching itself off for no apparent reason. I've had to restore 3 times already. Does anybody have an idea ? Thanks

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IPhone 4S Battery - Switching itself off

Hello,
For the past few months I've noticed a problem with my iPhone 4s.
When the battery drops below 50%, but usually arround the 20-40% mark it will switch itself off.
I try and turn it back on and it shows me the symbol that says it needs charging.
If i leave it for a few minutes (between 5 - 15) I'll be able to switch it back on and it'll show with 20/30/40% battery.
Or if I plug it in to charge it'll switch on immediately and again say I have 20/30/40% battery.
It used to happen once in a while, but then started to become more regualr, happening a couple of times a week.
So I took it into my local Apple Store and they ran a diagnostic on it, said that it wasn't showing a battery failure, but if I wanted to pay £130 they would replace the battery for me.
Has anyone else had this issue? It's completely random so hard to replicate in store, it just happens.
My iPhone is about 18 months old if that makes any difference.
Thanks

Forgot to say:
I've restored my iphone a few times since then and still happens.
And the woman at the Apple Store said she'd never come across this problem before.

MBP simply switches itself off while on battery

Hope to get some idea of what's going... basically yesterday while I was using my MBP on battery alone, the computer simply switches itself off out of the blue. So I check the temperature and everything seems fine. I was using it with video card in the "better battery life" mode, so I didn't think it was overheating. So I switched it on again. After starting, after a few minutes it went off again. I gave up and didn't switch on again until connected to the mains, and it is on until now without any problems.
Has anyone experienced this before? Any ideas of what's going on?
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I have experienced this before. I hate to be the bearer of bad tidings, but this is a sign that the battery is dying. You may well find that the time before this happens reduces until eventually you will get a few minutes at best.
You do not say how old the MBP is or if this is the original battery. My old one (recently replaced) went through the first battery in just over a year; and then a year later the second went too. I changed how I used the third one. I had relied on mains power when I could before. With the last one I used battery whenever I could and charged when necessary.
Make sure the battery is calibrated but I am not sure that is going to help.

Switching itself off

Hi
My home G5 iMac (the version before the remote control) has started turning itself off for no reason. Sometimes it would happen before the log in screen or sometimes after a few minutes.
Sometimes it will stay on for a few hours so it's all very random.
Any ideas anyone?
Thanks in advance
Rich

I started experiencing the same problem a couple weeks ago. The computer will switch itself off, randomly, for no apparent reason. I try to power it up and after several seconds will switch off. It is now working. I cleaned the vents, etc.
I also called Apple Care and was pleased to know I am under warranty for 50 more days. In the meantime, they had me reset the SMU and the accessible memory. We shall see what happens.
However, about a year ago, I couldn't even power it up. Took it in for repair. They replaced the power supply board, etc. Worked like a charm. But like I said, a couple weeks ago started having this new problem of shutting down. I'm going to make an appointment and hopefully get this resolved while it is still under warranty.
I have received some measure of comfort to learn that others have similar problems, but this is bugging me.

Mac Pro switches itself off immediately after power button is pressed on

Hi there,
I would like to share with you an ongoing problem of my Mac Pro (about on and off 11 month I think). Since its HD changed at the beginning of this year I've been having the problem of "switching itself off immediately after the power button is pressed on." I took it to Milton Keynes Apple Shop and apparently they couldn't replicate the problem I received it after they reset it's PRAM. Meanwhile I read the related posts and discussions about the problem and my assumption was as suggested in the scenarios of similar cause – Power Supply unit. I had a technical chat with ex-Solutions staff from Brighton, he also said it might have been caused by it.
I really don't know what to do because, sometimes attempting 10 or over times of pressing the button I hear the chime and literally 10 or 20 seconds later it switches itself off. And it happened this Sunday morning again, 8 times I've encountered the failure. And the most confusing thing is sometimes I leave it about an hour or two and then it just works and runs fine as it has never have happened.
By the way I left my computer on for a very long time I suspect maybe more than a month it was on sleep most of time when i am not using it. But yesterday I made the mistake of logging off and shutting it down. Now I can't turn my computer on. Highly frustrating and amazingly bizarre technical challenge.
Mind you I am fairly capable of carrying DIY operations on it. Previously I baked my graphics card as suggested in the forum – it works fine at the moment I am waiting until it completely brakes. But this power problem really really puzzles me.
Any opinions, how to solve this cause is highly appreciated.
Many thanks!
Specs:
Mac Pro 8 core
Xeon 5400 2nd Generation Early 2008
10 GB RAM
1 TB HD

The SMC especially on the very first 2-3 months of Early 2008.
Use to suffer from a "restart on wake from sleep" issue.
Some one told me that is not what "inrush current issue" is but that is what I (and couple others) called it.
Best to always have a workstation on 1500VA UPS.
Not share the outlet or cirucit even with anything major.
Yes it could I guess, poor phrase, but put more stress on PSU over time as a result also.
Methods to reset SMC have varied and changed over time. Thanks to web not all the revisions and older versions are kept online though to compare to.
Stories of people going on vacation etc for two weeks to come back to a "dead" Mac Pro started showing up in 2007.
If it had an actual SMC button, use that to reset.
If not, leaving it totally disconnected, and all external cables and such over-night, not for the mere 5-10 minutes.
Unplug but then press and hold power button for 8-10 seconds. And only once. And not to be done repeatedly. That was SMC Reset #3.
I know the 2007 8-core 3GHz had a different PSU than the smaller models.
2008 high end was 8-core 3.2GHz 5400 (stock was 2.8GHz 4 or 8-core)
FBDIMMs draw between 10W up to 15W each, so possible to have 8 DIMMs drawing 120W when maxed out. And heat. I always recommend Mac Pro use fan control to boost the fans a small 400 rpm to expel heat better and keep FBDIMM temps down. Heat, and temperature fluxuations stress and weaken components.
Other than AHT and the tools that a Apple Certified center should have, not much other than to swap out parts, monitor - iStatPro or Hardware Monitor -
And because of all this, I would setup a test system so you have a freshly formatted and installed OS and take it from there, with a better chance.
ATI 2600XT still? or upgraded?

My Imac occasionally switches itself off

My Imac(Intel) occasionally switches itself off. To bring it back to life I have to unplug it from the mains for a couple of hours. On plugging it back in the fan immediately starts up very noisily but nothing else happens. By holding down the on/off switch I turn the machine off. By pressing the on/off switch in the normal start up manner everything is OK. Anyone have any ideas as to what the problem might be?

First of all if you haven't cleaned the dust buildup out of your iMac recently unplug all cables, open the RAM cover and vacuum the bay thoroughly. Then vacuum all ports, the DVD Drive Slot, the opening across the top of the rear panel. If you have access to compressed air now would be a good time to give all those places a good blast of air, then vacuum again.Replace the access panel. Now you are in a good condition to do a
Reset the SMC
You can now start the system normally, hope this helps.

My macbook starts but switches itself off

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