Yes, you're missing an End If!

You could try this:

Private Sub ComboBox1_Change()
With Me.ComboBox1.TopLeftCell
If Me.ComboBox1.Value = "value1" Then
.Offset(0, 5) = "NIN"
.Offset(0, 6) = "NOUT"
.Offset(0, 7) = "IND"
.Offset(0, 8) = "TITLE"
.Offset(0, 9) = "CASE"
Else
.Offset(0, 5) = "something"
.Offset(0, 6) = "else"
.Offset(0, 7) = "more"
.Offset(0, 8) = "ofmy"
.Offset(0, 9) = "stuff"
End If
End With
End Sub

hth
Garry