I have a Dell Latitude D630 and the motherboard died, It's out of warrenty so I bought a Motherboard on ebay. The Bios Service Tag does not match the number on the bottom so I would like to chage it to the correct one. How can I do this?

I read about a DST CD = Dell Service Technician CD that has this option but I can't find one.

It's not a real important thing but when I use the Dell System ID application it reads the Bios Service tag and not the real system tag that Is registered to me.