As a follow up to the reply by jamescox, you could use a formula such as
=ISNA(A1) in your conditional formatting.

Note when you type =NA() into a cell, what you see is #N/A but as jamescox
points out this is not text but an error value
best wishes

--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"Supe" wrote in message
...
I had a spreadsheet sent to me that has the text #n/a in some of the
cells.
Want to to a conditional formatting to highlight any cell that contains
the
text #n/a but it is not working. Does anyone know why?