On Sat, 05 Jan 2013 20:33:38 -0500, GS wrote:

After serious thinking Ron Rosenfeld wrote :
On Sat, 05 Jan 2013 18:34:51 -0500, GS wrote:

I recommend using WMI to obtain the BIOS serial number because all the
values recommended by you and Isabelle (thus far) can be
edited/changed. The only way to change the BSN is to replace the
motherboard. In the case of a clone machine returning an empty BSN, I
substitute with a hash value of that empty string via SHA256. When this
is combined with make & model it serves well enough for my purposes.<g

Oh, and my machine is built by myself; your routine returns "To Be Filled By
O.E.M." (Which is what is in all the Chassis Information slots except for
Type: Desktop)

Interesting that this is the stored value. Obviously this is different
than what's returned in a commercial unit. For example, I find it
typical of clone machines released by Gateway to return an empty
string. Your case is a new one for me!<g

Doing a little more digging, using CPUID PC Wizard 2012, I note that my BIOS information does, indeed, contain an entry termed "Motherboard ID". However, as I wrote before, that is NOT what is returned by your code. It is obviously accessible, since PC Wizard accesses it, but I don't know how to approach this in VBA.