Good afternoon,
I've got a range of cells that I'd like to (whenever one changes) run the
VBA code against. I'd like the code to check that the changed cell has a
number value (either whole or in increments of 0.25). The cell may be null -
that's an acceptible value also. If the cell is not null, nor a positive
increment of 0.25, I'd like to automate a msgbox. Then, I'd like the cell to
be highlighted (as if it's the activecell with an F2 to edit it) to give the
user the opportunity to change the value of the cell. If it's still wrong,
I'd like to have it rerun the code.

Here's what I have so far, and it does NOTHING (that I can see):

Private Sub Worksheet_Change(ByVal Target As Range)
If Not Target.Value Then
If Target.Value 0 Then
If Target.Value < 100 Then
End If
End If
Else: MsgBox "Your cell does not contain a number. Please make the
correction."
End If
End Sub

What a) am I doing wrong, and b) do I need to do to complete my code?

All help will be greatly appreciated. Thank you!
DW