Blank screen after Software Update

Got a new iMac today. Moved my stuff over from my old iMac G5 and ran Software Update to move up to 10.5.1 but after the reboot I only get a blank white screen. I have tried switching off and on but again only the blank white screen. Have also tried booting from CD - do I need to do anything other than insert the CD before switching on?
I am relatively new to Macs and this is my attempt to move over to using a Mac as my primary machine, so I'm not very familiar with standard troubleshooting.
Ideas please...

Hold down the "c" key as soon as you hear the boot chime to boot to the disk. Once you have booted select your Language but then instead of going through the install process, go up the the Utilities pull down menu and open up Disk Utility. Repair Disk Permissions and Repair Disk then if all is good go to Startup Disk, select your 10.5 System volume and restart.
George

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Last edited by DarkLite1 (2014-06-09 14:45:50)

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What baltwo means is that helpers always want to know the Mac model & OS version of users with questions, since this info can be critical to understanding the problem & suggesting safe & effective solutions. This info is so important that it will automatically appear in each of your Discussions posts, but you must enter it in the "My Settings" page (available when you are logged into Discussions) for it to do so.
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Adding this info to your "My Settings" page will help all of us. So will filling in the Geographic Location blank, since this is an international forum & many issues relate to one location but not another. But note that most users do not reveal personal information like their name or email address, which could expose them to spam or other forms of harassment.

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Un-plug laptop, remove battery, wait a minute or so, then re-insert battery and AC, and turn on. Do you see *anything* on the screen, or does it remain completely blank? When you listen to the machine, does it seem to do anything? How about if you put in a start-up CD, then power on?

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There have been problems with the Apple servers not linking to support articles, so some links may not load the first time.
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Some general advice on updating:
It is worth noting that it is an extreme rarity for updates to cause upsets to your system, as they have all been extensively beta-tested, but they may well reveal pre-existing ones, particularly those of which you may have been unaware. If you are actually aware of any glitches, make sure they are fixed before proceeding further.
So before you do anything else:
If you can, make a full backup first to an external hard disk. Ideally you should always have a bootable clone of your system that enables you to revert to the previous pre-update state.
Turn off sleep mode for both screen and hard disk.
Disconnect all peripherals except your keyboard and mouse.
1. Repair Permissions (in Disk Utility)
2. Verify the state of your hard disk using Disk Utility. If any faults are reported, restart from your install disk (holding down the C key), go to Disk Utility, and repair your startup disk. Restart again to get back to your startup disk.
At least you can now be reasonably certain that your system does not contain any obvious faults that might cause an update/upgrade to fail.
3. Download the correct version of the COMBO update from the Apple download site.
The Combo updater of Leopard 10.5.8 can be found here:
http://support.apple.com/downloads/MacOS_X_10_5_8_ComboUpdate
If you prefer to download updates via Software Update in the Apple menu (which would ensure that the correct version for your Mac was being downloaded), it is not recommended to allow SU to install major (or even minor) updates automatically. Set Software Update to just download the updater without immediately installing it. There is always the possibility that the combined download and install (which can be a lengthy process) might be interrupted by a power outage or your cat walking across the keyboard, and an interrupted install will almost certainly cause havoc. Once it is downloaded, you can install at a time that suits you. You should make a backup copy of the updater on a CD in case you ever need a reinstall.
Full details about the 10.5.8 update here: http://support.apple.com/kb/HT3606
More information on using Software Updater here:
http://support.apple.com/kb/TA24901?viewlocale=en_US
Using the Combo updater ensures that all system files changed since the original 10.5.0 are included, and any that may have been missed out or subsequently damaged will be repaired. The Delta updater, although a temptingly smaller download, only takes you from the previous version to the new one, i.e. for example from 10.5.7 to 10.5.8. Software Update will generally download the Delta updater only. The preferable Combo updater needs to be downloaded from Apple's download site.
Now proceed as follows:
4. Close all applications and turn off energy saving and screensaver.
5. Unplug all peripherals except your keyboard and mouse.
6. Install the update/upgrade. Do not under any circumstances interrupt this procedure. Do not do anything else on your computer while it is installing. Be patient.
7. When it ask for a restart to complete the installation, click restart. This can take longer than normal, there are probably thousands of files to overwrite and place in the correct location. Do nothing while this is going on.
8. Once your Mac is awake, repair permissions again, and you should be good to go!
If your Mac seems slightly sluggish or ‘different’, perform a second restart. It can’t hurt and is sometimes efficacious!
9. Open a few of your most used applications and check that all is OK. In this connection please remember that not all manufacturers of third party applications and plug-ins, add-ons, haxies etc, will have had time to do any necessary rewrites to their software to make them compliant with the latest version of your operating system. Give them a weeks or two while you regularly check their websites for updates. This applies particularly to plug-ins for Safari 4.
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Lastly, Apple's own article on the subject of Software Update may also be useful reading:
http://docs.info.apple.com/article.html?artnum=106695
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Input Managers from third parties can do as much harm as good. They use a security loophole to reach right into your applications' code and change that code as the application starts up. If you have installed an OS update and Safari is crashing, the very first thing to do is clear out your InputManagers folders (both in your own Library and in the top-level /Library), log out and log back in, and try again.
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Additional tips on software installation here:
http://docs.info.apple.com/article.html?artnum=106692
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Again, the advice is to remove all Input Managers from the following directories:
• /Library/InputManagers
• ~/Library/InputManagers
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I rebooted my G4 running Leopard, there was a "software update" that installed several updates, my hardisk may not have had enough space....when the Mac rebooted after the update the wheel kept spinning. I rebooted and got a gray screen...Tried Command-S but still get not past a grey screen. Please Help!

Hi guido Deboeck;
Do you have a backup?
Did you have Time Machine turned out prior to the problem?
It sounds like the lack of free space has caused the files on your system to become corrupted. You may have to resort to an Erase & Install. This of course will wipe out everything that was on the disk hence my questions about backup.
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Blank screen after full update and reboot

As it is now, it goes to the point during boot, right before the resolution gets set to the right value, before I get a blank screen (no input to screen).
I have reinstalled several times, and tried a few different configurations. After all these attempts, I have practically memorized everything. This is what I do:
Setup is finished, and I reboot the computer.
# reboot
The computer reboots and I login to root.
# pacman -Sy
# rm -rf /var/run /var/lock; pacman -S filesystem --force
# pacman -S tzdata
# pacman -S pacman
# pacman-key --init; pacman-key --populate archlinux
I switch to the second terminal (Ctrl + Alt + F2) and create a user
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# passwd bompi
I write the password. Twice.
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Last edited by Bompi (2012-06-16 10:43:48)

I didn't know about the adduser script, but wouldn't the chown command fix the permissions? I did it this way in a virtual machine and got it working pretty good.
However, I don't think this has anything to do with the issue I am having. The main reason I made the user when I did, was so I had something to do to while the keys got generated. I never used the user except for a quick login to test.

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Kind regards,
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Blank screen after Software Update

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