Probably you'll be finding error messages in the logs if you are experiencing a HD failure, and frequently you'll be getting those messsages on the default console as well.
Have you run e2fsck on the file system? This is the best place to start. You might also run badblocks in non-destructive mode to see what it says.
Beyond that, if you want to get down and dirty with the drive, I recommend Spinrite. It costs $90, but it'll save your bacon if you are in fact experiencing a serious HD problem.
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