Lost power, now computer won't start

The power to my computer was accidentally disconnected while the computer was on. Now when I try to turn it on again it gets stuck on the white screen with the apple sign and the circel thinking wheel thingy. Don't know what's wrong and why it won't get past that point...

reset smc, unplug all the cables to your iMac then plug it back again after 15 secs.
reset pram, when you turn on the machine press option + command + P + R hold it down until you hear 3 chimes then let go
If it won't get pass the apple and spinning gear then boot from the OS X CD and repair the disks

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HELP! Battery drained and now, even with a power plug, computer won't start

My battery drained completely...and I went to charge it. When I plug the power cord in, it shows "green" not "red." When I remove the battery and just plug in the power cord, the computer won't start either.
Anyone encounter this before after a full battery drain? It's very odd.

I had the same green light non-charging problem. Turns out, I had to replace my wall adaptor. A dealer will have a good power supply you can try.
Wayne

Mountain Lion update, and now computer won't start up?

Writing this for a friend, as his computer is inop at the moment. Hence this message.
He has a new 27" iMac. He upgraded to Mountain Lion a few weeks ago, and then had intermittent problems with apps unexpectantly shutting down.
Now he did a ML update this morning, and his computer won't start up. It gets to the point of the Apple logo coming up, a progress bar, and then the spinning wheel, but then shuts itself down right afterwards.
A safe boot yields the exact same result.
Any thoughts out there on what he could try to get it up and running again?
Thanks much for any and all help.

Thank you for the fast response.
He was able to get into Disk Utility with the Command and R keys, but when he tried verifying the disk, in red it said 'Invalid Node Structure, volume could not be verified completely'.
He went ahead and verified it anyway, then proceeded to repair it. Howver, it stopped repairing, said it cannot repair, and that he should back up files and reformat the disk.
How can he back up his files? He cannot see a way to do it. Is there anything else he can do besides having to reformat the disk?
This is his first Mac (after much prompting from me to go Mac), and he's afraid he's now lost everything on there.

Updated OS to 10.5.7, now computer won't start properly...

Updated to OS 10.5.7 three days ago. After installation, system prompted restart (as usual). I clicked "restart", system properly shut down, then began to restart, then was stuck in restart mode for 3 hours! Gray screen with apple icon appeared, along with circling lines indicating it was "thinking" (I guess), then finally it just shut off. Now, it won't restart at all, just goes to gray screen for a few minutes, then goes black. Tried restarting from the system disk (10.5) which came with the computer, but I then get an alert saying it can't restore software because it can't find 10.4 or newer on the system. It shows my computer, with 10.5.7 on the startup disk menu, but selecting it and restarting throws me back into the gray screen/shut down loop.

Try starting in a different account or Safe Mode. Other issues have been related to font problems. You can test for this if things work in Safe Mode. A different account will check if it is something specific to your account.
[Mac OS X: Starting up in Safe Mode|http://docs.info.apple.com/article.html?artnum=107393]
[What is Safe Boot, Safe Mode? (Mac OS X)|http://support.apple.com/kb/HT1564]
[Safe Boot takes longer than normal startup|http://docs.info.apple.com/article.html?artnum=107394]
[Mac OS X 10.4, 10.5- Computer shuts down during Safe Boot|http://support.apple.com/kb/TA24054]
Safe boot mode runs a directory check command similar to that used by Disk Utility's repair. In Tiger it ignores some stored information (cache) that is normally read that speeds up the boot process, and it moves some other caches to the trash. It also uses only System fonts and disables all Startup Items, third party items, and any Login Items.
By the way, did you repair permissions with Disk Utility before and after doing hte update?

Messed with System/Library files now computer won't start

Ok, I wanted to go about fixing a Photoshop issue I had with 10.4.6. So I replace the following files with the files from 10.4.5...
/System/Library/Filesystems/AppleShare
/System/Library/Frameworks/AppleShareClientCore.framework
/System/Library/Frameworks/AppleshareClient.framework
My network drive went all haywire and I tried to replace the files with the original 10.4.6 files. After that did not solve the problem, I downloaded and used Pacifist to retreive the files from Mac OS X 10.4.6 for PPC downloaded from Apple. After replacing the /System/Library/ from this file, my computer went completely haywire and would not shutdown, start any aps or do anything. Now it won't work at all.
Am I completely screwed? I don't want to have to wipe everything (I have Quark on there that I no longer have a disk for) but I think I may have to.
Please if you have any suggestions for this stupid idiot, who should not have messed with their computer, they would be so welcomed!
Thanks!

HI, c.i.
See my "General advice on performing an Archive and Install" FAQ. Perform the steps therein in the specified order.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Lost Power - Now Project Won't Open!

I'm working on an iMac (10.10.2) with an external hard drive.
I was working on the project and some construction next door caused the power to go out. Now the project won't open. Every time I try to open it, the program crashes. I can open other projects from the same hard drive, just not the project that I was working on.
HELP!

IIf that opens, then go into the Original Media folders and look through all the clips and see if they're OK. Any clip that has an actual image that appears in the Finder should be OK. Any clip that has a generic QT icon may be corrupted. See if it will open in the QT player. You can also use QuickLook in the Finder and step through the files in the list to see if the run.
if you were titling also check through all the Fonts on your system and make sure none have generic document icons.

Tried to install 10.5, it failed, now computer won't start

I have 400mhz g4 with a 1.0ghz accelerator and 1 gig of ram in it. Tried to install 10.5 on, the installation failed for unknown reasons, now the computer gets stuck on start up. Specifically, I get the grey apple and spinning pinwheel, but the system just hangs there, even after 20 minutes.
I tried sticking the 10.5 and 10.4 disk in and starting up from (i.e. holding down the C key). I tried booting in safe mode and from the usb 2.0 disk that's attached via a PCI card. I have a complete backup of the machine, made via Super Duper, so I'm not really worried, but I just need to figure out a way to boot the machine. Any ideas?

What kind of 10.5 disk did you use? If it was a grey system disk from a newer Intel-based Mac, that disk has no 10.5 code that a G4 processor can read and could leave you with what you describe.
I tried booting ........... from the usb 2.0 disk that's attached via a PCI card.
In spite of what Apple says (here), it's hard to find a G-series Mac that likes to boot from a USB device. Do you have one with FireWire connectivity? And some system software may have to load before the USB bus wakes up. You can try it on oneof the logic board 1.1 ports--has a better chance of getting a boot from there than a PCI card. But don't be surprised if it still doesn't boot.
The 10.5 installer requires a minimum 867 mHz processor and may look at something stored in ROM on the computer rather than actually polling the new processor before deciding if it can install. Although you have an upgraded processor, the installer may be reading the original specs off the Machine type code or other parameter that was not affected by the upgrade.

Plugged in external harddrive, now computer won't start

So I had my Macbook Pro on and was doing stuff and then plugged in an external drive. All was fine, and then I went to open up Lightroom and Lightroom wouldn't open so I had to force quit a few times. Then the harddrive was "removed" even though I didn't touch it. I restarted my computer and now when it starts up, I get this. What happened? I was just about to back up everything on my drive.

You are booted into the Recovery Partition. Try a restart while holding down the option/alt key and see if you can select/start from the OS disk.
If not, boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the OS.
OS X Recovery
OS X Recovery (2)

Ran updates, now computer won't start up

Hi,
My sister just ran a bunch of software updates. A message appeared that said couldn't update iDVD because program could not be found. Then it asked to restart the computer, which she did. A grey screen appeared with the apple in the middle and a spinning disk. Then after a long while it went to a blue screen sometimes with a spinning disk again. She has tried to reboot but the same thing happens. Any thoughts? Thank you!!

Hi help209, and a warm welcome to the forums!
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Tiger Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
The usual reason why updates fail or mess things up, is if Permissions are not fixed before & after every update, with a reboot... you may get a partial update when the installer finds it doesn't have Permissions to change one obscure little part of the OS, leaving you with a mix of OS versions.
Some people get away without Repairing Permissions for years, some for only days.
If Permissions are wrong before applying an update, you could get mixed OS versions, if Directory is the slightest messed up, who knows!
If many Permission are repaired, or any Directory errors are found, you may need to re-apply some the latest/biggest updates.
May even need to do an Archive and Install if you have room on the HD, but saves all your files and gives a new OS...
http://docs.info.apple.com/article.html?artnum=107120
I only use Software Update to see what is needed, then get them for real via...
http://www.apple.com/support/downloads/
That way I can wait a week or so, check the forums for potential problems, and get Permissions & such in order before installing.
If all the above fails, then it appears to be time for a relatively painless Archive & Install, which gives you a new/old OS, but can preserve all your files, pics, music, settings, etc., as long as you have plenty of free disk space and no Disk corruption, and is relatively quick & painless...
http://docs.info.apple.com/article.html?artnum=107120
Just be sure to select Preserve Users & Settings.

Power company turned off power today. Now my computer won't start up. Light stays yellow.

Any ideas?

Hi,
Was computer ON during power outage ? If yes and it was doing some activities on HDD then anything can be happening. Hope this may help:
http://www.techsupportforum.com/forums/f10/solved-lost-power-now-computer-wont-start-307099.html
Good luck.
BH
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Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

My computer won't start now?

I was just recently impacted by the recent hurricane and lost power for about 6 days and just got it back. Well the night the power went out i was using my computer and said oh well i'll just wait till it comes back on. In the mean time i used a generator to power up my laptop and just used that for the time being. When we got power restored to our area, i went to turn on my computer but it would not start loading or any start up screen would not come on, the button on top was blue and i could here the fan blowing in the back, in fact i left it for about 4 hours to see if maybe it would start up, but nothing. I tried restarting it 5 times, but it still just shows the button on top is blue and nothing is coming on the computer screen. It seems like it's stuck in sleep mode or something. I've also checked to make sure the monitor was plugged, in at it was.
I also want to add that it does have a surge protector it's plugged too. It's a HP pavilion p6617c.
Any ideas or troubleshooting tips i should try.

Hi,
Was computer ON during power outage ? If yes and it was doing some activities on HDD then anything can be happening. Hope this may help:
http://www.techsupportforum.com/forums/f10/solved-lost-power-now-computer-wont-start-307099.html
Good luck.
BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

I did a factory reset on my late 2008 MacBook from a Snow Leopard disc. It installed fine, but as soon as I began to use the computer (safari) it froze. Couldn't even force quit. So I held down the power button to turn it off, and now it won't start up.

I did a factory reset on my late 2008 MacBook from a Snow Leopard disc. It installed fine, but as soon as I began to use the computer (safari) it froze. Couldn't even force quit. So I held down the power button to turn it off, and now it won't start up. It goes to the grey Apple screen and just sits there loud as can be. Help! Please keep in mind I've not done anything like this before and am going to need a little hand-holding. Thanks in advance.

Hi. Don't worry it's nothing serious. Insert the Instal Disc (Snow Leopard) and press the C button while turning on the computer. Once you see the desktop, go to Utility and choose Disk Utility. Select the Macintosh Partition on the left window pane and then click on Repair Disk and Repair Disk Permissions on the bottom right corner. Wait for both processes to finish. Click on the Apple icon (top left corner) and choose quit. Your computer should restart. See if it reboots normally. If not you can always reinstall the OS following the same steps. Good luck!

Running an old MacBook Pro 2.5ghz core 2 Duo. Battery went chemical meltdown and expanded out of its housing. Removed it and was running off the power cord. This worked for a while. Now it won't start up. Have a Replacement on order. Is there a bigge

Running an old MacBook Pro 2.5ghz core 2 Duo. Battery went chemical meltdown and expanded out of its housing. Removed it and was running off the power cord. This worked for a while. Now it won't start up. Have a Replacement on order. Is there a bigger issue or does a battery need to be in the compartment to boot up? Appreciate any help. Thanks.

Working battery needs to be in for the computer to function.

Computer won't start up after power outage....

We just had a power outage when our computer was on and now that our power is back, the computer won't start up. (I'm typing this on our power book!) I hold in the button on the back, get the "bong" and then the computer whirs for a while with a black screen and then just dies. What to do??

You can, in addition to Barry's excellent suggestions, reset the SMU.

Computer won't start after power outage

After a circuit breaker was shut off the computer won't start. I cleaned out the computer and got the light to go green by putting a hair dryer to it.
When I push start button and hold it up to 10 seconds it will not start.
The computer is a compaq presario sr5130nx

Typically what happens during a power outage is not good. It can do strange things. If it took using a hair dryer to get the green light on the back to come on, that is a bad sign. HERE is a troubleshooting guide for power supplies. Start with that.
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Lost power, now computer won't start

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