Centrifugal pumps are not self-priming. That means that you have to flood them with water before turning them on. If the pump is not flooded, then the impeller cannot center itself and the pump will rattle. In moving your system, you might have done something that is causing the pump to fully flood, hence, no more rattling.
Tell us more about your system. Do you use a reservoir? If not, how do you remove all air from the system? Air in the system might cause the problem.
Also, tell us about bringing your computer to the LAN party. Did you tilt the computer at all?
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