Sub Yeller()
Dim c As Range
Dim msg As String
For Each c In Range("A4:A8,A12:A16,A20:A24,A28:A32")
If c.Interior.ColorIndex = 6 Then msg = msg & c.Address(False, False) & ", "
Next c
If msg <> "" Then MsgBox Left(msg, Len(msg) - 2), vbInformation, "Yellow cells"
End Sub