DNS is an acronym for Domain Name Server, and is the system used to translate word-based addresses of systems (such as www.tonicpower.com) to the numerical IP (Internet Protocol) address of the computer or system that should be located at the address.
When a domain is newly registered, the nameservers are changed, or DNS changes are made, you can expect a propagation time up to 24 hours. This is because it takes time for the DNS to take effect across the internet. The actual time of propagation may vary in some locations based on your network setup.
Have a look at this TechRepublic article for troubleshooting DNS problems. If this does not help, contact your DNS provider hey should be able to sort the issue for you.