Hi Pat,

One way

Option Explicit

Private Sub Worksheet_Change(ByVal Target As Range)

On Error GoTo ws_exit:
Application.EnableEvents = False
With Target
If .Address = "$A$1" Then
If Application.CountA(Range("B1:T1")) 0 Then
MsgBox "Data in B1:T1"
End If
End If
End With

ws_exit:
Application.EnableEvents = True
End Sub

'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.


--

HTH

RP
(remove nothere from the email address if mailing direct)


"Pat" wrote in message
...
I need a warning to appear when a user enter a value into A1, if there is
a
value in any cell in the range B1:T1

Any one got a solution?
Thanks
Pat