Shuts down won't reboot

A couple days ago while using my macbook (purchased august 2006) the screen went black, and the computer restarted, all on its own. About 10 seconds after the desktop appeared, this happened again - screen goes black, computer restarts. This kept happening a couple more times, so I just held down the power button and turned it off. Later the computer booted normally, but later that day it did it all again. I powered it off again, and now when I tried to turn it back on it just goes to the grey screen with the apple, and stays there forever. I pushed the option button at this stage to try to boot from my external hard drive, and then it just suddenly continued booting and went to the desktop, and is working fine - for now. Another possible factor is that a couple months ago my hard drive died and I got a new one. Thanks for your help!

I would reinstall your operating system. Back up your files using time machine first if possible.

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Install maverik on my MacBook Pro, I had no problem. Two days later I was shut down suddenly and reboot with a closed padlock and asking me for a password that does not match any of mine. What I can do?

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Try booting to the Recovery drive, running Disk Utility and Repair disk and Repair Permissions.
1. Reboot and immediately hold down command and R (two keys).
2. When you see the screen shown on this page, select Disk Utility and continue.
3. When DU is running, select the hard drove on the left, First Aid and Repair Disk.
4. After Repair Disk, click Repair Permissions.
Quit DU and restart.

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Unable to shut down - won't allow me to close down system preferences

Hello jdreed3,
The error message you are receiving is usually because of a failing hard drive. Can you go into the BIOS and run hard drive tests?
Here is a similar thread in regards to the same issue where the user discovered it was indeed the hard drive that has fried that has been giving him the issues.
recieving a 0x4001100200000100a when using the factory recovery DVDs
If I have helped you in any way click the Kudos button to say Thanks.
The community works together, click Accept as Solution on the post that solves your issue for other members of the community to benefit from the solution.
- Friendship is magical.

My macbook suddenly shut down, and when rebooted, imovie project was completely gone. No record of it at all. Have been working on it for days, and it has always been there. Any way to restore it? Thanks.

My macbook suddenly shut down, and when rebooted, imovie project was completely gone. No record of it at all. Have been working on it for days, and it has always been there. Other projects are still there. Any way to restore it? Thanks.

I figured it out!!!
Hey guys! Here's what I did that saved my project.
-SHORT VERSION-
Use the Finder window on your Mac to copy and paste your old project (the one not showing up in imovie) to a new folder so that iMovie will see it.
-LONG VERSION-
CONDITIONS:
The project has to exist on your hard drive. To see if it's hiding around somewhere go to:
Home (your name)>Movies>iMovie Library (right click and select Show Package Contents)
In the iMovie Library folder (the default is usually the date) open it to see if your Project is inside. If it is, you are in luck!
RESTORING PROJECT:
Open iMovie
start a new folder under the iMovie Library (again, the default is usually todays date)
Close iMovie
In the finder window (as explained above in the CONDITIONS section) select the files and folders of your project and copy them (in my case these consist of folders called Analysis Files, Original Media, "MYPROJECT", Render Files, Shared Items)
There should now be a folder with today's date in that Show Package Contents folder.
Paste a copy of your project;s files into this folder.
When it is done copying, open up the "Original Media" folder and all of your images and clips should be present.
reopen iMovie. Your project should show up in the Libraries list.
*If your full project isn't showing in the iMovie timeline (mine just had empty bubbles where all my clips and audio should be) try dragging and dropping the clips and images from the project's "Original Media" folder into the import section of your project. Once the files were reimported, iMovie recognized them all and put them back in the correct place for me.
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Hello
Just wondering if anybody could help us with this issue as the Apple Genius's failed to...
Our early 2006 Intel Imac has recently started to switch off at random times. There doesn't seem to be any particular point at which it will do this and no warning either. It's as if somebody has pulled the plug out but the power supply has not been touched! It then often won't allow you to switch it on again until you have left it over night - or sometimes it will switch on after a few minutes.
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We did take it to the Apple Store, who said they had kept it on for a day and could not replicate the issue so therefore there is nothing they can do...
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Hello and welcome to the club of "random shut down".
Since 8 days I am also having this problem on an early 2006 2 GHz intel core duo with OS 10.4.11 After approx. 5-10 minutes it shuts down and the only way to wake up again is to disconnect the plug, wait 10 sec and connect it again and push the start button on the back.
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Hi
Have you solve your problem yet? Mine was the same - it's Dockables "fault"
Were you able to boot into Safe Mode, by pressing and holding Shift key at Start up, I think you need to press and hold a while, till you see a progress bar below the Apple logo.
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montanarama wrote:
My Macbook Pro retina display mid 2012 with OS 10.9 has been acting more and more erratically.
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Ok, so I went to try that and run the program it said I needed .Net Framework 4.0 installed, so I was on my way to update that so I could try to run the program.
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That works too: Force an app to close on your Mac - Apple Support

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David ...
Hopefully you can boot in Safe Mode so you can find out which OS X is installed. Troubleshooting advice can depend on that information.
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Shuts down won't reboot

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