hi,
It would have helped to know which cells and where the hyperlink was going
but try this. Right click your sheet tab and view code and paste this in.
Enter 99 in a1 and a hyperling is created in b1 to sheet 1 a1
Private Sub Worksheet_Change(ByVal Target As Range)
If Range("A1").Value = 99 Then
ActiveSheet.Hyperlinks.Add Anchor:=Range("B1"), Address:="", _
SubAddress:="Sheet1!A1", TextToDisplay:="MyText"
End If
End Sub
Mike