A whois query suggests that you have got it sorted. You may have had a short term access issue if your ISP was slow in updating their DNS records.
When moving sites it is advisable to keep the old site open in parallel for a week to allow the new DNS record to propagate. This is done by ISPs in their own time. When I first ran a site some only updated every few days but now most (but not necessarily all) should be there within 24 hours.