Three ways to find Service Tag: You can't do the first way, since you have no motherboard, and you said that there is no longer a sticker. So, maybe the third way?  I looked in my original invoices for a couple of Dell purchases and they don't specify the Service Tags. It's possible that it might be in a Dell database tied to the original order number or to the customer number of the purchaser. There certainly is information that is findable in the other direction, from searching on the Service Tag. When I enter the Service Tag on the Dell support site, it tells me when the system was delivered and what country it was delivered to. If the motherboard was destroyed, then I don't see what value the Service Tag would have. If it was not destroyed, then it could be possible for someone to install it in the same model laptop and see the Service Tag.
Hey guys! I was wondering if its possible in any way to find a service tag off of a PC that the motherboard was removed? We have older computers that we are trying to decommission and at some point the motherboard was pulled from one so its essentially an empty shell, and the sticker on the bottom is gone. I'm assuming that there's no way to figure out the service tag but thought I would ask!    Thanks in advanced!
Is it possible to find a service tag on a PC without a motherboard? Latitude 
7390