Re: Dell XPS 720
The service tag on Dells are tied to the motherboard. If you have the original information you had when you bought the system, that's all you need. The service tag has no software driven basis (other than using the Dell autodetect feature on their support site, or when giving it to a technician on the phone) so it's not a big deal.
Also, why in the world do you need a 1k power supply?