'
Dim iRow As Integer, iCol As Integer
Dim oRng As Range

Set oRng = Range("a1")

iRow = oRng.Row
iCol = oRng.Column

Do
'
If Cells(iRow + 1, iCol) <> Cells(iRow, iCol) Then
    Cells(iRow + 1, iCol).EntireRow.Insert shift:=xlDown
    iRow = iRow + 2
Else
    iRow = iRow + 1
End If
'
Loop While Not Cells(iRow, iCol).Text = ""
'

End Sub