"Press power button for five seconds to re-start computer" sign????

I was using my computer and all of a sudden a black sign poped saying that I had to press the "power button" for five seconds to re-start my computer. I tried to ignore the sign but I couldn't. So I had to press the button. My computer turned off so I waited for a bit to turn it back on like I usually do. When it re-started, I had a new sign saying that my computer was turned off improperly. Is this normal? And why could this have happened?

Hi and welcome to the forum.
What you saw was your MacBook having what is termed a Kernel Panic. Information on what a Kernel Panic is can be found here:
*What's a "kernel panic"? (Mac OS X)*
http://docs.info.apple.com/article.html?artnum=106227
Should you be worried? If it happens often the you should have it looked at. Kernel Panics are often (not always) attributed to memory module faults but anything (hardware and/or software) can cause them.
If you do not get a Kernel Panic again then I wouldn't worry about it and carry on working as normal.
Kryten

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    Message was edited by: WZZZ

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