Have you been getting a "Internet Explorer cannot display the webpage", "Problem loading page" or "Server Not Found" message when attempting to reach your favorite website or forum? If so, the reason could well be that site is on one of the 9000 servers located in The Planet's H1 Data Center in Houston, Texas.
Yesterday at 4:55 PM CDT, electrical gear shorted creating an explosion and fire that knocked down three walls surrounding the electrical equipment room. Fortunately, no one was injured. After evacuated personnel were allowed to re-enter the facility, they determined that no servers in the data center were damaged.
The return to normal service by that data center is going to be a long process. They expect to be able to provide initial power to parts of the H1 data center beginning at 5:00 p.m. CDT today. At that time, they will begin testing and validating network and power systems, will turn on air-conditioning systems and monitor environmental conditions. It is expected that the testing will last approximately four hours.
After a determination is made that all systems are properly working, they will be able to begin to power-on customer servers in phases. Considering that this huge server farm impacts around 9,000 servers and 7,500 customers, do not be surprised if it takes a while before your favorite site is available.
I am only aware of a few of the thousands of impacted sites, those being LandzDown Forum, MyCity, Trojan Hunter Forum and VoiceOfThePublic (and VOP customers).
Update: I just learned that this outage has impacted approximately 1/3 of the avast! download/update servers. Please be patient if you are attempting to update your avast! software.