Excel - Shading entire row based on change of value

Question

I would like to shade entire rows in Excel based on the value of one cell. For example say I have the rows below:

**File No**
1122
1122
1144
1155
1155
1155
         


        

Answer 1

A simpler version of one of the above answers. Column A is the key.
Yes, it needs a helper column.  That's column K.
1) Set first cell in table to TRUE (K8)
2) On second row at K9, and to end of table (K99), paste: =IF(A8=A9,K8,NOT(K8))
This gives a pattern of TRUE...TRUE, FALSE...FALSE,...
3) Select key column A1:A99, or whole table A1:K99
4) Set Home/Conditional/New Rule/Formula  =K8
5) Format as you wish for the TRUE cells
6) Select the range from (3) and Right-click Format White (or whatever
background color you want) for the FALSE cells

Note that this solution (and the others) have a major flaw, in that this
highlighting doesn't work properly when you have filters active in your
table.  I want that fix :)