External storage device not showing up in finder

I have an imac with an external storage device for back-up.  Up to now when I turned on the device it would show up in Finder.  Now it's not.  I have checked the connections (firewire), restarted the computer but it's not showing up.  What should I do or try?

TRY THIS SOLUTION, EASY!
I'm a GOOD mac user. Not a genius, but pretty good, used it for years.
BUT SOMEHOW THIS ESCAPED ME:
In the finder, on the left side, scrol down to DEVICES.
Mouse over slowly to the right of that word and it says SHOW/HIDE.
Well.. Mine were hidden!
That's it!

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