.. Whenever I made changes in X, ...

You got it wrong. The updates are supposed to be made in Y, not X. X is the
base reference. Pl read the earlier suggestion carefully. It should work as
stated.
--
Max
Singapore
http://savefile.com/projects/236895
xdemechanik
---
"kaci" wrote in message
...
Hello Max,

I tried your method by using exactly X and Y worksheet, then using Col A,
but it still does not work. Whenever I made changes in X, the Y worksheet
does not show the conditional formating.

Please kindly advise.

"Max" wrote:

.. all cells are non blank.

Ah, sorry to have missed that earlier. It's considerably more difficult
now,
but to an extent, perhaps you could try this op/play ..

Assuming source data is in col A in sheet: X

Make a copy of X for the daily updates, name this sheet as say: Y

In Y,
Select col A (click on the col header "A")
Click Format Conditional Formatting
Under condition 1, make it as:
Formula is: =A1<INDIRECT("'X'!A"&ROW(A1))
Click Format button Red fill n white font/bolded? OK
Click OK at the main dialog

When "updates" are made in col A, ie it's presumed the data values are
changed to other/different values, then the cells will be formatted: Red
fill
n white font/bolded. If the update involves clearing data in Y, the
format
will also be triggered.

Then at the end of each day, after you've noted whatever's triggered in
Y,
simply copy col A in Y and overwrite col A in X with a paste special as
values. This readies Y for the next day's updates. In daily operation, X
would/could be hidden safely away.
--
Max
Singapore
http://savefile.com/projects/236895
xdemechanik
---
"kaci" wrote:
Hello,

Thank you. However, all my cells are already filled with information,
ie.
all cells are non blank. So it does not work.

What else can I do? All my cells are non blank, but I would like to
know
which cells have been changed by users.

Thanks