VBA to Automatically add to range for drop down menu and prevent duplicates

Hello,

I have the following code which for some reason is not working and I can't figure it out. If the value = True, then the code runs fine but if the value = False, the MsgBox "Machine already exists. Please select from dropdown." still pops up. For some reason it will not do anything if the value = False. Can someone let me know what is wrong with the code? If you need anything additional, please let me know. Thanks!

Sub GoChange()
On Error Resume Next
Dim lReply As Long
Dim inputWks As Worksheet
Dim lRsp As Long
If inputWks.Range("MachineName") = True Then
MsgBox "Machine already exists. Please select from dropdown."
Exit Sub
Else
If inputWks.Cells("MachineName") = False Then
lRsp = MsgBox("Machine not in database. Add to dropdown?", vbQuestion + vbYesNo, "New Machine")
If lRsp = vbYes Then
Range("MachineList").Cells(Range("MachineList").Rows.Count + 1, 1) = Range("$J$6")
Else
MsgBox "Please select Machine that is in the database."
End If
End If
End If
End Sub