IMac not booting up after power failure

work around for at home/personal users which should work, the OS try's to retrieve user authentication Info from the previous logged on user so disconnecting the network cable or disabling or turning off the WiFi/ wireless should do the trick, just make sure the power is fully drained or have the power cable or battery disconnected for 25-30seconds to ensure the power is drained from the system. For all those Domain Admins/Users enable do not write on the users directory so the OS doesn't recognize a user account to try and retrieve info, if you perform this the OS will just create a temp user profile folder and delete it when theirs a power failure and not try to look for it after the power failure when booting up not causing to give you the gray boot up splash screen and go right into OS X, hope this helps and good luck!

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Imac will not boot up after power failure

Does anyone know why i have to unplug the power cable from the back of my imac after every power failure at my home to get the imac to boot up. I've tried resetting the surge protecter and unplugging there. However, the only option is to unplug the cord from the back of the monitor/imac before it will boot up. Any ideas or is this a known bug.

You're effectively resetting the SMC.
If you're getting that many power outages you need to be using a UPS (Uninteruptible Power supply), not just a surge protecter.
Power interruptions at the wrong time can cause directory damage or even physical damage to the Hard Drive if the heads were reading or wriing at the time.

Trouble booting up after power failure

After power failure(two hours), when booting up imac, just get a grey screen with blinking folder icon containing question mark.
I can hear clicking noise (hard drive?) that goes two or three clicks and then seems to give up.
How do I get it rebooted. Have disconnected and tried again with no result.

Sounds like the power failure may have fatally damaged the HD. Going forward use a UPS to protect your system, power surges can be very damaging to computers. You and try troubleshooting using Apple's Flashing question mark appears when you start your Mac but I think you may find the HD has failed. For confirmation you cal also run Apple Hardware Test in extended mode. Run AHT about 3x back to back and if it reports errors it's time to take the machine in for service.

Imac wont start up after power failure

i moved the table my imac was on and i accidentally took off the power cable.the imac was on so when i took the cable off it shut off. then i put the cable back and tried to turn it on but nothing happened..it is like dead. any suggestions?

Also, there is a small battery or capacitor on the logic board that may need to be replaced, as this has been the cause of a similar issue over many generations of Mac computer hardware. Of course there are other causes of failure, and that is why the help of an expert to troubleshoot and diagnose issues to attempt to resolve them can take time.
And it may not be resolved after the first attempt if the actual problem is deeper than first best educated guess arrived by troubleshooting. Part of some repairs requires replacement of suspect parts, even if they may not be the cause, to eliminate their being within the realm of possibility. A good read is among the original Apple Technical Service Manuals, those aren't often available to the general public. I used one to self-troublehoot an iMac under AppleCare after the nearby 200+ miles one-way distant 'specialist' could not fix my new iMac, four times. So I am a bit cool on newer Macs; the way I see it one new headache lasting 10 months and requiring 3,000 miles travel, to not be resolved by experts (and under warranty, so I can't touch it!?!) is enough.
The best cure for main power failure, is to have a good high quality battery backup system in place with automatic voltage regulation, that also works as a power filter; and can step in to isolate the Mac from mains high-or-low power fluctuation. This can save many products from bad power sources; do not rely on these, either. Make copies of your work ahead of time. This saves your computer from issues you can prevent.
PS: my Macs seldom are shut off, for up to 11 months, some of mine only get to sleep when not in use. When the main power goes offline, during a storm or extended utility failure of their own making, I will have to shut them off as a choice. There is software in the UPS unit that can help shut down automatically, and that is a choice, too. I usually find their software problematic on occasion; and the battery backup is not very long in duration, so one with a few hours runtime and a method of rationing the power if you are present when the mains fail, is helpful in performing a normal shutdown after a power failure.
Good luck & happy computing!

IMac Not Booting - Probable Hard Drive Failure

Hello, my 24" iMac (Early 2008) has stopped booting up, and I've been suspecting HDD failure. When it boots, it gets to the white screen, I get some weird noise from the drive, and then a floppy disk with a question mark appears.
I inserted and booted from the Mac OS X install disk, and the only instance where it even recognizes the existence of a hard drive is when it is indicated as "Media" and is described having a capacity of zero bytes.
I'm just trying to confirm that the problem is the hard drive, and see if I did the right thing by buying a new Hard Drive. The disk doesn't show up in disk utility or when I choose to restore from a time machine backup (luckily, I lost no data with my Time Machine backups).
I appreciate any advice you can give (including tips on the hard drive replacement procedure).

If you ran Disk Utility from the install disc that came with the computer and it cannot see the HD then it appears it's the internal HD. You can also run AHT, here are the instructions:
http://support.apple.com/kb/HT1883
I believe AHT will let you know the HD has failed. As far as instructions for replacing the HD it's not for the faint of heart, if you are comfortable working on notebook computers then you could probably do it. Remember internally an iMac is more like a notebook than a PC. If you are not comfortable doing this type of surgery (BTW there are many videos on how you can find using Google) then it should only be about a $200-300 repair from a AASP.
Regards,
Roger

IMac not turning on after power outage

The new iMac arrived and I register at the beginning screen, etc. I'm at the end of the registering when I accidentally pulled the cord out of the iMac. Now when I try to turn it on, nothing happens. At all. I've tried taking out all devices, etc. Nothing will work.

{quote:title=jasperblunk wrote:}I've tried taking out all devices, etc{quote}
first, please explain what You did here...
is the line cord still in tact?
the power connection, on the back of the iMac, is it loose?
Thanks,
den
.

How to configure V240 auto-boot after power failure?

Hi!
How to configure automatic boot of V240 machine after power failure? After power gets resored, V240 remains in standby mode and one has to press button on front to power it up. It is not convinient because power failure can occur, for example, at night and the machine is not booted until the first user awakens :)

Uhh... I've found publicly accessible document http://docs.sun.com/source/817-5481-11/variables.html :
Looks like this variable controls auto-power-up behaviour:
sc_powerstatememory
The sc_powerstatememory variable enables you to specify the state of the host server as false (keep the host server off) or true (return the server to the state it was in when the power was removed). This is useful in the event of a power failure, or if you physically move the server to a different location.
For example, if the host server is running when power is lost and the sc_powerstatememory variable is set to false, the host server remains off when power is restored. If the sc_powerstatememory variable is set to true, the host server restarts when the power is restored.
The values for this variable are as follows.
true - "Remembers" the state of the host server when power was removed and returns the server to that state when power is reapplied.
false - Keeps the server off when power is applied.

IMac won't boot anymore after power cut

Thanks to the great storms in New Jersey, my iMac does not boot anymore after a power cut. Does not get past the apple logo screen with the spinning wheel and keeps rebooting every 2 minutes.
I was able to mount the HD via Firewire on a host machine and the disk seemed fine.
I booted from the Install disk and ran Disk Utility - seemed fine though I could not verify the disk permissions ?
One other thing - I seemed to remember the white light (front bottom right) was blinking before during start-up. Now it goes and stays black after couple of seconds.
Help please,
Philippe

HI Phillipe and Welcome to Apple Discussions...
If you haven't done so, try running the Apple Hardware Test.
http://support.apple.com/kb/HT1509
I doubt repairing disk permissions can't help this problem. It sounds like a hardware issue.
*"I booted from the Install disk and ran Disk Utility - seemed fine though I could not verify the disk permissions ?"*
When you ran Disk Utility via Firewire, did you actually Verify the hard disk for errors?
Carolyn

Imac has white screen and spinning wheel and will not boot up---after lion install

imac has white screen and spinning wheel and will not boot up---after lion install

Please read Gray screen appears during startup.

Macbook will not boot up after running Software Update

My MacBook will not boot up after running Software Update (Security update + Java?) earlier today. I have only the gray start up screen + Apple logo + gear wheel constantly rotating. I have tried restarts several times and tried to start up from my original system DVD - this makes no difference.
I called Apple support, tried resetting the power and PRAM - still no difference. He had no knowledge of other problems reported; although I note recent post may have same issue.
I cannot get an appointment at my Apple Store before Monday.
Any suggestions?

Still no success. When I hold down the option key when powering up I get the hard disk icon plus arrowhead (only). When clicking the arrowhead it goes to the gray screen + apple logo+ rotating gearwheel.
This happens both with DVD in slot and without DVD. the DVD image is not coming up on screen. When I start up without DVD the hard disk icon appears promptly. When I start with DVD in the DVD is spinning for a short period before the hard disk icon appears. On clicking the arrowhead to hard disk icon the DVD spins again for a while then stops. Apart from the DVD spinning, both situations result in gray screen + apple logo+ rotating gearwheel.

Domain controller VMs using dynamic VHDx corrupt after power failure

Over the past couple of months I have experienced 4 dead 2008 R2 SP1 domain controllers after power failure on Hyper-V 2012 hosts. The domain controller VMs will start after power failure and have varying degrees of file system corruption. In each instance
the corruption has rendered the domain controller unusable. The problem has not occurred with every power failure, but in testing the failure rate has been over 10%.
The Hyper-v 2012 hosts are as follows:
Dell PowerEdge r720 with flash backed write cache on Raid controller
Dell PowerEdge T710 with battery backed write cache on Raid controller
Dell PowerEdge T310 with a single SATA hard drive and write cache disabled
Generic system with a single SATA hard drive and write cache disabled
The VM configuration experiencing corruption is as follows:
Each VM was created from a base 2008 R2 SP1 syspreped VHDx image template file (40 Gigs)
The image template was originally created as a VHD and was then converted to a VHDx
The VHDx file has 512k sectors instead of the native 512e of VHDx files (a result of VHD - VHDx conversion)
Each VM was assigned 1024 Meg RAM and 1 virtual processor
The domain controllers were created by promoting the base 2008 r2 install to a DC after base image deployment
Only one corrupt VM was not running the 2012 integration components. The rest were running current 2012 integration components
I have done extensive testing on this issue and the problem for me seems to revolve around the VHDx file format. I have managed numerous Hyper-v installations since the original 2008 server version was released and I have never seen corruption like this
until 2012 and VHDx.
For the past few days I have been testing fixed sized VHD VMs on a 2012 host and I have not been able to reproduce the data corruption issue. I seem to only be able to reproduce the problem when using dynamic VHDx files. I have not done any testing on 2012
hosts with fixed size VHDx files or dynamic VHD files.
It would be great to hear from anybody else experiencing similar issues so that we can compare notes and hopefully get to the bottom of this problem.

To be honest I was excited to see this fix released, but there are two problems.
1. The hotfix causes BSOD if you have VLANs with a teamed NIC configuration. I found this out the hard way on a production system. How in the world did this thing get through testing and into automatic updates?
2. The hotfix does not seem to resolve the issue in my test environment.
I opened up a case with support and they informed me that they would not provide support for this issue and that I had to open a case with premier support. Premier support informed me that I cannot open a case with them unless I sign a $50,000 per year service
contract. Is there anywhere to get support on this issue?

Lenovo IdeaCentre Q180 behavior after power failure

Hi,
I need a computer which reboots itself after an power failure.
I didn't find anything about the behavior of the IdeaCentre Q180 in such case.
Does the IdeaCentre Q180 reboots itself after power failure or is it possible to enable this feature?
This behavior is very important for my new system.
Thank you for your answer.
Kind Regards,
Theodoor
Solved!
Go to Solution.

Hi theodoor, welcome to the forums,
I'm not personally aquainted with the Q180, but I had a look in the BIOS simulator and I'm pretty sure the function you're looking for is available in BIOS.
Please see attached picture, (too big to post), it will open in the same window so please click your browser back button to return to this site.
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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RE1000 power light blinking after power failure

I've tried the 8 sec reset and the 30-30-30 reset but can't get the light to stop blinking and so can't connect to the unit. It was working fine before the power went out. Any suggestions?

I had the same issue after a power outage today. I online live chat with an agent for about 15 minutes until he provided me three options all about that I would have to pay extra to get it replaced or fixed because mine was just out of warranty yesterday. I was lucky enough because mine RE1000 was not dead completely. I followed the instructions in this community and restored its service successfully.
Here is what I did.
1. Reset the extender by 30-30-30 method. The LED still blinked after reset.
2. Turned off wifi on my laptop and assign a static IP on my laptop: 192.168.1.x. Ping RE's default gateway 192.168.1.1 with an Ethernet connection. It returned good result.
3. Log on Web Admin Page and I was prompted to upload its firmware. Followed the screen instruction to upload the firmware that I already downloaded previously. Waited until everything was finished and it rebooted. Volla. It was back to life.
I guess it might have lost the firmware somehow after power failure. Is there a battery inside the extender to power the flash rom?
Here are few instructions I followed up:
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=ca96fc48798d43489b4d16f9d77c14f9_Guidelines_in_Man...
http://kb.linksys.com/Linksys/ukp.aspx?pid=80&vw=1&articleid=25153
http://kb.linksys.com/Linksys/ukp.aspx?vw=1&docid=7e4956723e074191bdf33777314ddfd8_3998.xml&pid=80&r...
Cisco/Linksys/Berkin, you **bleep**. It is not that easy to rob my money what I earn by hard work.
Thanks for all advice and good luck.

Ipad mini will not boot up after charging

ipad mini will not boot up after charging

Hi luckysue,
If your iPod mini isn't booting up or responding after charging, you may find the troubleshooting steps outlined in the following articles helpful:
Reset your iPod - Apple Support
iPod only shows an Apple logo and doesn't start up - Apple Support
Regards,
- Brenden

Windows xp will not boot up after installation of desktop software 4.3.

windows xp will not boot up after installation of desktop software 4.3. Where do I start to get my p.c. going again ???

I get the message that a recent hardware or software change might have caused this.
The computer does not boot up in safe mode or last known good configuration.
I'm glad you think the software has nothing to do with it, but perhaps you can also explain why this problem started as soon as I downloaded the desktop software and tried to restart the computer.

IMac not booting up after power failure

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