When was the first time Virginia tech played enter sandman before a football game?

Answer 1

From a Sept. 26, 2009 Washington Post article by Mark Viera...

The famed entrance was created because Virginia Tech erected a scoreboard, before the 2000 season, with a large video screen and the university's athletics marketing team wanted to create an entrance video for the Hokies. While the film production was contracted to a producer, it was up to the marketers to find the right music.

There were a handful of songs in consideration, including "Welcome to the Jungle" by Guns N' Roses and the Alan Parsons Project's "Sirius," which already had gained attention as the Chicago Bulls' entrance music. Virginia Tech's marketing team settled on Metallica's "Enter Sandman."

"Enter Sandman" was first used at Lane Stadium for the 2000 season opener against Georgia Tech. Although the game was canceled before kickoff because of torrential rain and lightning, the song had caught on.

The second element of the "Enter Sandman" mystique came later. Before one particularly chilly night game, some of the Virginia Tech marching band members started jumping up and down to keep warm before the team's entrance. Soon, everyone copied.

Link to full article: http://www.washingtonpost.com/wp-dyn/content/article/2009/09/25/AR2009092502363.html