Try something like this:
Code:
dim Valid = True
For Each cell In Worksheets("MyWorksheet").Range("A1:A10").Cells
If cell.Value = "False"
Valid = False
End If
Next
' Do something with Valid...
*Caveat: not tested and it's been a while since I wrote any VBA
You will need a then after "false" for sure. Possibly better to do:
Dim myCell as cell
Dim myWorksheet as Worksheet
Dim myRange as Range
Dim valid as String
Set myWorksheet = thisworkbook.sheets("MyWorksheet")
Set myRange = myworksheet.range("A1:A10")
For Each myCell In myRange.Cells
If myCell.Value = False then
msgbox "There is a False at row " & myCell.row
' or do anything else when it finds a cell with false
Else
' do something here when it finds a true cell
End If
Next
Set myworksheet = nothing
Set myRange = nothing
If all you really need to do is find whether there is a cell in a single array which contains false rather than try to find which cells actually contain false. Then simply do =countif(A1:A10 (i.e. your array range), false) in any cell and if the result is greater than zero you have a false. That assumes you are evaluating the cell as a boolean not a string. If its a string you will need to convert it or stick it in quotation marks.
Edit: or just use the inbuilt validation, and put =false in the formula and you can then highlight all the cells in one go.