Hi [NAME]  please click on Product Support and paste Latitude E7240 Ultrabook so that your laptop information can be revealed. When different system board installed the service tag ID will change, but seemingly your BIOS has not been updated. The old service tag ID label on the laptop would have been changed if system board (aka motherboard) changed under Dell warranty service.   Please do not post private System Service Tag or Express Service Code in this public forum. This information will be rejected and removed. Forum Code of Conduct - Dell Community Paragraph 15. 
Hi Have just got hold of a Latitude E7240, boots to bios, but when I put in the service tag# on the Dell site for downloads etc, it is not recognising the tag number !. cheers Spike[IMAGE]
Latitude E7240 tag number !