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Did you install this update by itself, or were there other updates installed at the same time? Is the iMac a new model?
I would hold the power button down for 5-10 seconds to shut it down, then try restarting and see what happens. If you get it restarted, run repair disk and repair permissions. If it's a new iMac, you've probably downloaded a lot of updates, and it could be this. Good luck!
Morod

I had a similar problem on my macbook. After Software Updates had finished downloading the package and I hit OK when asked to reboot, the machine wouldn't reboot because it allegedly couldn't terminate the apps that I had running (although Process Monitor revealed that they weren't running anymore). I force rebooted from the console (sudo shutdown -r now).

After rebooting, I ran Software Updates again, and the installation proceeded without problems.
 
MBP 15" one year of good work just died after this update (boot with blk screen) no previous gpu glitches or anything :confused:
 
MBP 15" one year of good work just died after this update (boot with blk screen) no previous gpu glitches or anything :confused:
You can try calling Apple [1-800-APL-CARE (1-800-275-2273)] and they'll walk you through some steps to try and resolve the problem or you can take it an Apple Store. When I took mine to the Apple Store, it stopped booting completely (nothing they did, it just didn't boot), so I hope your issue doesn't become mine.
 
Tried installing this on my iMac G3 running 10.4.11.
Software Updater failed at it, so I downloaded it manually.
It began installing and then had an error.
So I just restarted the computer.
Now it won't boot into the OS - it goes through the grey apple screen, then to the blue loading screen, where it appears to load everything normally, and once the bar is totally full, it just sits there...

Cool.
 
Tried installing this on my iMac G3 running 10.4.11.
Software Updater failed at it, so I downloaded it manually.
It began installing and then had an error.
So I just restarted the computer.
Now it won't boot into the OS - it goes through the grey apple screen, then to the blue loading screen, where it appears to load everything normally, and once the bar is totally full, it just sits there...

Cool.

I ended up just reinstalling Tiger, didn't feel like messing with trying to fix it.

In case any of you were on the edge of your seat worried about it.
 
after installing this update my computer no longer recognizes the resolution settings for my monitor. has anyone else experienced this or know how to fix it?
 
My problem went away when I removed an old flash drive from the USB port, which I happened to connect at about the same time as when I installed the update


It's something much more serious than this. I have now installed the update, and it takes forever to boot with no peripherals attached. Frequently applications wont quit, even from activity monitor or terminal, if my machine is on overnight it crashes and needs to be rebooted in the morning, time machine always has to "prepare" for several minutes before it does it's thing. I'll have to do a clean install. Unfortunately I don't have any of my discs here, so I will have to try using migration assistant from time machine to get all my apps back after the install, but I'n not that confident about time machine atm as its behaving a little funny too.
 
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