Restart message when I shut down

I have been getting a message telling me I need to restart my computer for the last two days. It started after the last update. I believe it a security update. Has this been happening to anyone else?

Is this message on a grey screen and in 3 languages? If so, you are experiencing a kernel panic.
Here is a link to a good troubleshooting section of the X Labs regarding;
Resolving Kernel Panics
And an overview of KPs from the Apple Knowledge Base;
What's a "kernel panic"? (Mac OS X)
Also, you are posting in the iMac Intel area. It would be better to post your issues in the iMac G5 area;

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