Macbook Pro loading bar on start up and shuts down

hey guys, when i turn on my Macbook Pro, it shows the white screen on the start up with the apple logo and a loading bar below... before the loading bar reaches the like 1/5 of the bar.. IT SHUTS DOWN.. Whats happening here? what could i do?

See Mac OS X v10.6- Gray progress bar appears under Apple logo during startup

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Load bar at start up, then shut down. HELP NEEDED URGENTLY!!! plss....

Load bar at start up, then shut down. HELP NEEDED URGENTLY!!! plss..

The startup disk may need repairing.
Startup your Mac while holding down the Command + R keys so you can access the built in utiliites to repair the startup disk if necessary or restore OS X using OS X Recovery

Replaced Logic Board, RAM, and hard drive connecting wire, but Macbook Pro 15' (Mid 2010) now freezes and shuts down randomly

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Check to see if you've any panic logs -> http://support.apple.com/kb/HT2546.
If so, post the text of the latest.
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My macbook pro begins start up and shuts down.

It gets to the grey screen, the apple symbol shows up and a load bar comes on. Once the load bar is at half it shuts down. Any suggestions? It started occurring after a system update.

Reset the SMC and the NVRAM:
http://support.apple.com/en-us/HT201295
http://support.apple.com/en-us/HT204063
Then try a Safe Boot:
http://support.apple.com/en-us/HT201262
Any change?
Ciao.

Hi my iMAc 27 inch starts up to the grey screen with apple logo and loading bar underneath it loads halfway then freezes up and shut down after a while please help

Hi my iMAc 27 inch starts up to the grey screen with apple logo and loading bar underneath it loads halfway then freezes up and shut down after a while please help

Try the tips listed here Mac OS X: Gray screen appears during startup - Apple Support

Hi. There is a ghost search bar on my iMac screen which flashes constantly, even during start up and shut down. How can i make this go away? Please help. x

Hi There is a ghost search bar on my iMac that flashes continually, even during start up and shut down. How can i make this go away? Please help. x

Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
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.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

Slow to start up and shut down

Hi.
I have updated MacBook Pro from 2.16 GHz with OS 10.4.11.
The old one started up and shut down very fast. Now my new 2.4 GHz one starts up very slow.
I see the gray screen forever till finally see my desktop. It happens even I installed the OS on a cleaned HD.
Cleared all the cache, there is no log in items.
Reseted the PRAM.
No problem with Disk permissions.
Both 1GB memories are recognized.
I did everything I could think of.
Does anyone have any idea what is wrong ?
I would be much appreciated if any one know !
Thank you.

22 sec startup
Definitely an improvement over our old IBM AS/400 mainframe that once took six (6) hours to start up after a bad shutdown....

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On Thu, 20 Dec 2007 09:12:26 GMT, Rolf Lidvall wrote:
> See this article by Shaun Pond:
> "Using Search Policies Effectively in ZENworks"
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If you are asked to email me information please remove the - in my e-mail
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I tried many times to turn it on, it turns and the same white screen appears and the update starts again and shuts down. Please Help me!

Hello!
I have a MacBook Air. I have got a software update notification couple of days ago. I've clicked on it today, and it started installing updates.
But, I have got a notification telling that not all updates were installed successfully, then I have clicked on "Restart" from the notification box. Then my Mac restarted and the white screen with Apple logo and the update progress appeared (like what always happens during updates).
The problem that while the update progress reached around half the way, my Mac shutdown. I tried many times to turn it on, it turns and the same white screen appears and the update starts again and shuts down.
Please Help me!
MacBook Air (11-inch Mid 2009)

Welcome to Apple Discussions
You did not state whether you installed the update while on battery (not mains) power. You are warned not to apply certain updates without being connected to a charger & mains power.
Also remove any attached peripherals.
Reboot in Repair mode (command-R at start) and use Disk Tools-Disk Utility-Disk First AId to repair your disk, and as long as you're there repair permissions. Next quit Disk Tools and reinstall the OS. After completing that successfully reboot, log in and do a combo update.
You must have more than enough (not just enough) empty (free) disk space for the update.

How do I decrease the start up and shut down time?

Processing pin wheel becoming more prevelant an time for start up and shut down is increasing.

Start by using this utility that is already on your Mac:
Using Activity Monitor to read System Memory and determine how much RAM is being used
What Mac OS X are you using?
How much Green in the pie chart? How much Blue?
How many pageOuts since last startup?

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I went to Disk Utility, clicked Erase, and then "Erase Free Space." When I saw that it was going to take 1 hour and 30 minutes, I tried closing disk utility. It wouldn't let me exit, so instead I pressed "Skip." But when you hover over the "Skip" button it says, "Erase all data and reformat the disk."
I'm wondering if the fact that I pressed the skip button has anything to do with my computer shutting down/starting up A LOT slower now. If so, what can I do to fix it?
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Thank you to those who replied to my question!

Slow start up and shut down

Dear mac users,
I know this might be normal for every Mac or PC,
my PB is 6 months old, and it's start up and shut down time is kind of slower than before, can anyone kindly tell me the reason about this please??
Thanks^^

Try using Disk Utility to repair your startup disk (hard drive) as shown in Dr.Smokes repair thread.
Doing the things in his link is a good start for a monthly maintenance program.
Do everything in the link and let us know.
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Hi all,
My G4 MDD FW800 DP.1,48 starts up and shuts down after about 20 seconds. I Have reset PMU and checked battery voltage, witch was OK. (also had it out for 30 minutes with no power connected etc.) I have video and also tried with NOTHING connected. But still it just powers down and failes to enter start up procedure.
Last time I had it running I pulled my iPod, beacause the computer did't see it, the next thing I saw on screen was the message to hold the power button for 5 to restart, after that I got the problem described above.
Anybody?
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Hi, I don't know how fast it shuts down, but...
How to reset the SMU/PMU on a Power Mac earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/ht1379
In fact, do 3 in a row, takes a bit of time.
Does it boot into Open Firmware with CMD+Option+o+f ?
http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
set-defaults (press Enter)
reset-all (press Enter)

HT1199 my computer displays grey screen and apple logo for 10 minutes or more during start up and shut down. sometimes it refuses to shut down . this issues started after installing OS lion. what do i do?

my computer displays grey screen and apple logo for 10 minutes or more during start up and shut down. sometimes it refuses to shut down . this issues started after installing OS lion. what do i do?

I don't think it's exactly an incomplete installation brody, but most likely in-correct permissions somewhere along the line that either happened, or became magnified during the upgrade. Also, it could be corruption as well.
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That should fix the issue, if not, we can start doing a PRAM reset and SMC for good measure.

Macbook Pro loading bar on start up and shuts down

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