After software update, iMac has trouble booting

I have a 17" white intel iMac (bought november '06).
I recently had to archive and install (long story)
Everything works except after every software update that requires a restart, my mac doesn't restart right. I hear the startup noise a few times, getting softer every time until it is not audible. The iMac stays on the gray screen until I hold the power button down and manually restarted it.
I tried resetting PRAM a few times, but it didn't help.
How can I fix this?
Thanks!

Are you sure you really had a problem? After a system update, it's normal for the imac to stay on the gray screen for a couple of minutes, then even reboot sometimes. If you've interrupted the process, you probably do have trouble now. I'd download the combo update from the downloads section of this site, run that, and give it time to restart itself.
If you mean it was stuck for like half an hour or something, that's not normal.

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0xffffff83a4b43fa0 : 0xffffff800043a40f
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com.apple.driver.AppleFileSystemDriver    3.0.1
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com.apple.driver.AppleUSBHub    705.4.1
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com.apple.security.TMSafetyNet    8
com.apple.nke.applicationfirewall    161
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com.apple.driver.AppleThunderboltDPInAdapter    4.0.6
com.apple.driver.AppleThunderboltDPAdapterFamily    4.0.6
com.apple.driver.AppleThunderboltPCIDownAdapter    2.0.2
com.apple.driver.AppleThunderboltNHI    3.1.7
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com.apple.iokit.IOEthernetAVBController    1.0.3b3
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Message was edited by: ayn

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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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http://docs.info.apple.com/article.html?artnum=106692
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• ~/Library/InputManagers
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After software update, iMac has trouble booting

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