Cannot start mac

The computer is an August 2011 Intel based 27" iMac. The machine has a history of not starting at all after an even like switching the power off as if it was completely dead. After leaving power off for a day or two, the machine then starts like nothing has happened. Now the machine will not start at all. Has anyone else experience this and what advise can be given to start it.

Although bdaqua, who frequents these boards, may be able to offer some Terminal wizardry to diagnose what's going on, I'd first try resetting the SMC controller. Here's how:
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
After that, I'd try booting from the Recovery partition and running Disk Utility --> Repair Disk...then Repair Permissions.
Hopefully, something here will help.

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Cannot start Mac mini server after changing permissions

I have a two-day-old Mac mini (server version) and all was OK until I decided to change the permissions on both hard drives (and all enclosed folders and files) to give read/write access to administrators. I received quite a few error messages about invalid kernel file extensions (I think) which I elected to ignore or override. Then when trying to log off, the machine hung.
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Please help!

HHMNY wrote:
I have a two-day-old Mac mini (server version) and all was OK until I decided to change the permissions on both hard drives (and all enclosed folders and files) to give read/write access to administrators.
doing this completed scrambled your system. you now have no choice but to reinstall Snow Leopard.
and in the future NEVER use "apply to enclosed items on ANY system created folders. and certainly NEVER EVER use it on the whole system drive.

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Hi,
This issue occurs as the current navigation pane in Outlook is not working properly. We can try to use the command "Outlook.exe /resetnavpane" to clear and regenerate the navigation pane for the current Outlook profile:
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after last security update mac mini cannot see anymore the new 7200 rpm hddisk which worked like a charm since that…
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tmma.a wrote:
I thought that erasing was formatting as well;
no, it's not. there is probably something wrong with the partition map of the drive which is why your mac firmware does not recognize it as a boot drive when you restart. simply erasing the drive won't fix it. reformatting might.
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Hello gero1954,
Thanks for using Apple Support Communities.
From your post I see that your Mac is unresponsive. To try and fix this issue, I'd like you to please restart your computer.
Restart
Do any of the following:
Choose Apple menu > Restart.
Hold down the power button until you see the restart, sleep, or shut down dialog, then click Restart, or press R.
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Important: If you force a restart, you may lose unsaved changes in open documents.
If you don’t want the app windows you currently have open to reopen when you restart your Mac and sign in, deselect “Reopen windows when logging back in.”
OS X Yosemite: Log out, sleep, restart, and shut down
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but if I use another user account it works fine. I have uninstalled and re-installed Creative Suite but no differene.
Are there some logs or cache's that I need to delete or something??
There are a few things to try but it means the problem is in the account itself. un- and reinstall the Suite will not help if you are not also using the Adobe cleaner tool for this job:
http://www.adobe.com/support/contact/cscleanertool.html
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And if all this is not helping you then you can use the Apple recovery disk to reinstall your system, this is what before was known as an Archive and Install procedure. This creates a new user library while all your custom settings and files are being kept.
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See Here for
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Reinstall OS X without erasing the drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
=======================================
Reinstall - Mavericks, Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.
Reinstall Mountain Lion or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is
three times faster than wireless.

Solution: mac os x cannot start up from this volume

I purchased a new WD 300GB SATA drive recently to replace a failing OEM 250GB drive in a G5 tower. I installed the new drive and ran the 10.4.3 Installer DVD. I opened Disk Utility, selected the new drive, clicked the Erase tab, etc., etc. Went back to the Installer, saw an error: "You cannot install OS X on this volume. Mac OS X cannot start up from this volume."
Long story short, it appears that sometimes Disk Utility doesn't actually correctly format the drive. The key thing to look for is that if you go to Disk Utility and select the physical drive volume, then hit Get Info, under Partition Type it will say "FDiskpartitionscheme," even though it claims to be formatted Mac OS Extended, Journaled. The Installer will reject any disks not listed as "Applepartitionscheme."
The solution is to go back into Disk Utility and try different methods of reformatting (select the physical drive, select the logical volume, Erase, Partition, etc.) until you get "Applepartitionscheme." Then it should work fine.

To install Panther, you need the retail install version CDs (black with silver X). I suspect you are trying to use a model specific version or upgrade version (gray), that won't work.
When you formatted the new drive, did you check to install the OS 9 drivers? The drivers need to be installed if you want to be able to boot OS 9.x. If you just want to be able to run in classic mode, the drivers are not necessary.
If OS X has never been installed on your Mac, you need to check if your Mac requires a firmware (Boot ROM version in System Profiler) update. Mac OS X: Available firmware updates
http://docs.info.apple.com/article.html?artnum=86117 If an update is required, the update must be installed (using OS 9) BEFORE you install OS X.
 Cheers, Tom

Upgrade "Mac os x cannot start up from this volume"

I'm trying to upgrade my tiger installation with leopard, but I get the message "Mac os x cannot start up from this volume". It is the internal disk and I have a Linux install too on that disk. Earlier I used Refit but I have removed it. Do I have to repartition? Partiontabel is GUID-partiontable in diskutil.

sigge44 wrote:
I'm trying to upgrade my tiger installation with leopard, but I get the message "Mac os x cannot start up from this volume". It is the internal disk and I have a Linux install too on that disk. Earlier I used Refit but I have removed it. Do I have to repartition? Partiontabel is GUID-partiontable in diskutil.
Removing an app or bootloader like rEFIt or OS such as Linux does not ensure that the drive is back to where it was before you installed these programs.
Even having a partition for TechTools eDrive will cause problems.
First I would run DU and check/repair your HD and then run a file permission verify/repair and zap the PRAM.
I would then suggest backing up Tiger and Linux with clones and completely erasing the HD using the full (not quick) erase and then installing Leopard and migrating your Tiger material back.

Mac os x cannot start up from this disk

I have a 2008 MacBook Air which runs Leopard. I want to upgrade to Snow Leopard and then Lion. I have the Snow Leopard family pack disk and try to do the install but it say 'Mac OS X cannot start up from this disk' and shows a yellow triangle with a !
I went to the genius bar and they told me to put the Snow Leopard disk in the superdrive and restart holding down C and it would then work - but it did not. I also saw on a forum about using disk utility and partion and resizing the partition then putting it back as it was originally and then re trying but I get the same message.
Anybody got any ideas?

Saw an article by Topher Kessler: http://reviews.cnet.com/8301-13727_7-10330520-263.html
The extract from that article below worked for me.
Note when I first resized the partion (comment above) I did not 'apply', this time I did and then resized back to the original full size and hit 'apply' again. Although when the install starts it shows the size of the partion to be the smaller (temporary) size, it is not and the install completes with no issues.
Boot from the Snow Leopard DVD and select your language. Then launch "Disk Utility" from the "Utilities" menu and perform the following steps:
Select your boot device (the device above the boot volume name), and select the "Partition" tab.
Resize the partition by selecting the volume name in the rectangular volume representation and drag the bottom-right corner of it to change its size.
Click "Apply" to change the partition's size.
Revert the change by dragging the same resizing corner back to the bottom, and click "apply."
After this is done, quit out of Disk Utility and try installing Snow Leopard again. Since you are booted from the Snow Leopard DVD you should be able to continue immediately without having to reboot your system.
Hope this helps others. Thanks Topher!

Cannot start mac

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