A Dell technician replaced my Inspiron 600m motherboard and now the computer does not recognize its own service tag or express service code.  I had to re-install all my software and some of it will not install because it does not recognize the service tag.  Can I somehow manually enter this directly into the BIOS?  I know there are some naysayers out there who claim that there should be no reason to have to re-install the service tag, but believe me, some programs and drivers will not install unless they recognize it.   I appreciate any information or instructions on how to re-install these codes.  Thanks in advance.

Adam