…from the IT jargon dictionary…
rain dance 1. Any type of activity aimed at sorting a hardware problem while expecting the effort to have no tangible effect.
2. Any sequence of mysterious actions exerted towards a computer in order to reach a certain aim. It usually consists of rituals, incantations, and similar psychical activities. Voodoo programming, black arts, cargo cult programming, waving with a dead chicken, and reading runes on printed circuit boards.