Hi

Validation should do it:

Select B5 goto Data Validation Allow: Custom, Formula: =T10="OK"
Enter your message under the Error alert tab.

Well, you do get two buttons OK/Cansel If you press cansel the value entered
is just deleted, if OK then B5 is selected for reentry.

Or you could insert this macro on the code sheet for the desired sheet:

Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "$B$5" Then
If Range("T10").Value = "Error" Then
Msg = MsgBox("Both Values do not agree", vbOKOnly)
Target.Select
End If
End If
End Sub

Regards,
Per



"Seanie" skrev i meddelelsen
...
I am looking to create a simple POP up box that would appear if a
value in cell T10 = Error. Along with a message "Both Values do not
agree". Then just an OK button, once pressed would return the cursor
back to cell B5

The value in T10 is dependent on what the user inputs in to cell B5.
Obviously if T10 = "OK" then the POP up should not appear

Thanks