It originally was called ZDTV by its founder, Ziff-Davis, when it debuted on May 11, 1998. It later was owned by Paul Allen's Vulcan Ventures. Vulcan Ventures sold TechTV to G4 Media (owned primarily by Comcast), which merged it with the video game channel G4 in May 2004 to form G4techTV. In February 2005, the name was changed back to G4, eliminating TechTV from the name completely.
The personalities of TechTV include Kate Botello, Roger Chang, Yoshi DeHerrera, John C. Dvorak, Carmine Gallo, Ali Hossaini, James Kim, Kris Kosach, Pam Krueger, Chris Leary, Chi-Lan Lieu, Jim Louderback, Tom Merritt, Megan Morrone, Patrick Norton, SuChin Pak, Bill Rafferty, Kevin Rose, Martin Sargent, Catherine Schwartz, Adam Sessler, Laura Swisher, Morgan Webb and Liam Mayclem
Many former hosts of TechTV programs have gone on to create new programs distributed online: Leo Laporte's This Week in Tech, Chris Pirillo's live.pirillo.com, Systm, thebroken, From The Shadows, commandN, Diggnation, Infected with Martin Sargent, DL.TV, CrankyGeeks, InDigital, East Meets West, and Weezy and the Swish are some of the shows produced by alumni.
Leo Laporte hosted Call for Help which aired until April 6, 2007. It was revamped and renamed The Lab with Leo Laporte and was shown on G4techTV Canada and the Australian HOW TO Channel. The show was filmed in HD and Laporte hoped to have it picked up by an American network. The series has since been cancelled due to poor ratings.