When I turn off my mini, and at other random times, i get a message saying I need to restart my computer

When I turn off my mini, and at other random times, i get a simple message that says I need to restart my computer.  any suggestions?

The message to restart your computer, in multiple languages, is a kernel panic. This is usually, but not always, caused by hardware, with memory being the leading cause.
You might want to run the Apple hardware test, which is on the original gray-faced OS X disks that came with the mini. FInd the one that says 'AHT Version x.x' in small print on the label, insert and reboot holding the alt/option key down. Choose the Apple hardware test, and when prompted, choose the extended test. You can also download Rember from http://kelleycomputing.net/rember/ if you want to really test the memory. Set it up and let it run over night.
See this kernel panic FAQs for other ideas: http://www.thexlab.com/faqs/kernelpanics.html

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