MySQL 99.9% of CPU? Help

For the last couple of days, MySQL on my server has been running at 99.9% of the CPU. It is on a dual xeon 3ghz. We're not doing anything hew that database intensive. The last time I remember, it is not this high, not 99.9%.

I rebooted the server, and still it stays the same.

I would appreciate some suggestions.

I have attached my process list.

 

 

 

 

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