Hi
Cannot take credit for this, found it via Google, and have not tried it yet
Public Function MBSerialNumber() As String
'RETRIEVES SERIAL NUMBER OF MOTHERBOARD
'IF THERE IS MORE THAN ONE MOTHERBOARD, THE SERIAL
'NUMBERS WILL BE DELIMITED BY COMMAS
'YOU MUST HAVE WMI INSTALLED AND A REFERENCE TO
'Microsoft WMI Scripting Library IS REQUIRED
Dim objs As Object
Dim obj As Object
Dim WMI As Object
Dim sAns As String
Set WMI = GetObject("WinMgmts:"

Set objs = WMI.InstancesOf("Win32_BaseBoard"

For Each obj In objs
sAns = sAns & obj.SerialNumber
If sAns < objs.Count Then sAns = sAns & ","
Next
MBSerialNumber = sAns
End Function
see
Regards
Ken Reay
Freelance Solutions Developer
Boldon Information Systems Ltd
Website needs upgrading, but for now -
UK