Won't restart after installing updates

Hi everyone,
I downloaded the 10.5.2 upgrade through the software updater, and my computer crashed during installation.
When I tried to restart it, it got stuck on the grey apple logo screen, with the progress cycle spinning. It stays stuck like this for an hour.
I tried safe mode restart then (with the shift key help down), and that didn't help anything. Is there anything else I can try?
Thanks!

Hi there,
I have had the same problem after installing the update. The system hang at this position with all fans running for which I have shut down the computer each time but with the same outcome after new booting. Lastly, I booted holding the C key and this worked. Might be a coincidence, worth a try.
Cheers

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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won't open at all. I click on it and it just won't
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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.
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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.
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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, 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.
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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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Hi,
I have just finished installing new updates, and in order to complete, I had to restart my laptop, as I did so, an error screen came up with all types of jargon on it, mainly, 'panic' and 'kernel', I can not do anything with my mac now, any ideas on how to resolve?

If you can't boot in the usual way, try a safe boot.
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MacBook Pro won't restart after Mavericks update

I recently installed the new Mavericks update on my MacBook Pro and after downloading Pages, Keynote etc. I had to restart. When I try to restart however, the Apple logo appears with the progress bar but as soon as the bar is full it switches off.

Hello SerenAlyx
Check out the articles below to go over troubleshooting the issue of the grey bar when you are starting up your Mac. It will go over starting up in Safe mode as well as booting to your Recovery Disk to maybe reinstall OS X Mavericks.
Gray progress bar appears under Apple logo during startup
http://support.apple.com/kb/ts3148
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Regards,
-Norm G.

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