The Y2K bug was a computer software flaw based on a time factor that, at the start of the year 2000, might have caused all manner of problems. Shannon O'Donnel experienced the hysteria that arose from this potential issue, although she noted that in the end, the bug caused no problems at all, failing to turn off even a single light bulb. (VOY: "11:59") This prediction was almost correct; a nuclear power plant in Japan had a monitoring computer go down briefly, and minor events elsewhere occurred, but nothing major.