Cannot boot up, shut down after 5% progress bar

Newbie to Mac OS - recently ported over from Windows since July '12, when I gotten Mac Mini.
Shut down Mini as usual before I went to bed one fine night.
Strangely, I noticed the power light is still on the next morning.
Turn on monitor and saw a strange box with 4 options.
I click X to close it.
I could see the the title of this is Disc Utility.
It also presented me with 3 options now after clicking the X.
"Boot from Macintosh HD something..." or "cancel" or "Restart".
Being a newbie to Mac, I chose Restart, thinking it's a safe bet.
(Things I remember of this is vaguely now).
Now, the Mini refused to boot up.
It'll go to the initial screen with Apple logo.
The spinning wheel is visible.
Also, there's a loading bar below it.
The bar will move like 5% only before it shuts down!
I've tried Safe Boot (holding down shift key), but nothing happen.
I may be doing it wrongly though.
Additional info, while performing shut down that night, keyboard is tuck away cramp in a bag. Could that changed something if some keys were pressed while shutting down?
Also wondering if wireless USB keyboard is working during boot up - in case that nothing happened when buttons are pressed.
Hope to continue my learning journey with Mac OS.
I guess best way of learning and trying things is when episodes like this happen and reading hours of info from the Internet.
Thanks.

Just gotten into Recovery now.
Verify Disk fail - Invalid key length.
Prompted to run Repair Disk.
Repair Disk fail - Invalid key length. The volume Macintosh HD could not be verified completely.
"Error: Disk Utility can't repair this disk... disk, and restore your backed-up files."
Quick question...
1) does this confirm that hdd had failed?
2) is there any way to retrieve data before any replacement?

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Progress bar at startup, then shuts down immediately, during progress bar

It started when my iMac started running a little slower then usual, so i decided to restart it just incase something wasnt working properly,
then when the startup apple came up a grey progress bar comes up underneath, loads to approximately 15% then restarts the progress bar,
and then the whole system shuts down.
Any ideas on what to do? Or just get apple to check it out?

WorriedUser wrote:
Yes, i already read this, but the problem is, it wont turn on at all, it gets to the startup then shuts down after the progress bar is no more then 10-15%
OK, then it's time to take it in to have it serviced at an Apple Store or AASP.

My MacBook won't go passed a grey screen and the apple logo . It has a loading bar but doesn't do anything and just shuts down after the loading bar is complete... HELP!

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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 3
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 4
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 5
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 6
Boot in safe mode. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 7
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 8
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 9
Repeat Step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 10
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a boot failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 11
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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Dear all,
this is a question too complicated for me to answer; I have previously tried to solve this problem in a usenet forum (comp.sys.mac.system) - but we didn't get it solved there, and I finally gave up on it. However, it still persists, and it is so annoying that I want to try another approach on it this time using the Apple Discussions Forum.
The problem is as follows: my relatively new (bought in december '09) MacBook Pro 13" (2.53 GHz Intel Core 2 Duo, 4 GB RAM) has a problem: always when I leave it untouched for one hour, something within the system would try to make the computer shut down (system halt). Please note right that this seems NOT to be a hardware-related issue (al least not simply a bad mother-board or sth. similar - there are a lot of threads about MacBooks that seem to shut down immediately, like fainting - this is not the case here). Instead, the system behaves like anytime when a user-requested shut down is invoked - for example, the running applications would check if any changes should be saved, and ask questions. The only thing is: I did not request a system shut down, and even more: I do not WANT the system to shut down. In fact, this whole problem is extremely annoying, since it constantly messes up my open documents (e.g. the TextMate workspace I usually set up, or similar things), forcing me to reestablish my workspace at least once a day. Over time, this can be very annoying for a computer that's used for work!!
During the course of my earlier discussions in the forum, we tried to find out what makes the computer go down - looking through the system log files etc. - but to no avail: we couldn't trace back the event that has caused the system to invoke the shut down procedure. However, it seems that this issue is related to the Mac operating system, and not the hardware - and this is why I ask this question here (and not in the MacBook Pro section). It may be that we simply didn't look in the right place - or not with the right tools - and I hope that there may be some people here with some new ideas how to trace the reason for this procedure. Everything I can tell now with some certainty (and I couldn't do it before in the usenet forum) is that the shutdown seems to be invoked about one hour after the system has been left untouched by a user (no key strokes, no mouse movements); I know this because I use my Mac for a wake up call now - and, since I sometimes need more than an hour for that, I can tell that this problem causes iTunes to quit one hour after the Mac has booted (which makes my wake-up music to switch off... and some of the running applications with no changes to save).
It would be very important for me to solve and remove this annoying problem, and I think that this really shouldn't happen! Needless to say, I haven't set the energy savings settings such that the system would shut down after one hour (in fact, I have set the system to always stay on when attached to a power supply); still, the problem prevails.
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Yes - it is a bit frightening... Had other Macs before this MacBook (Pro), and never experienced such a problem. Don't know - of course I look into the Preference settings from time to time, and maybe I have changed that setting on the other computers... it never occurred to me...
What an annoyance such a simple decision to make the auto-shutdown after one hour a default can be! Probably, Apple reconsiders :-D I'd rather prefer an auto-lock of the account (instead of an auto-log off)... but I believe it has been expressed often enough that, in this particular case, the - pardon me - Windows-solution (to offer a simple lock of the account, the Windows-L-key combination, IIRC) is much more practical... to copy that behaviour under Mac OS X, You'd have to go through lengths...
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Best,
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Cannot boot up, shut down after 5% progress bar

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