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If I put my computer on the floor rather than on the computer shelf will it be grounded?
Ha, ha very droll! To understand ground circulating currents you have to understand the relationship between capacitance, inductance, voltage and currents in a computer system. Circulating currents can cause problems when output currents cause a difference between the actual output voltage and the feedback voltage as well as when the output ground currents move the power supply's analog ground off its true ground. They also cause problems when the output current in the supply and ground rails interfere with the delivery of an accurate voltage to the system and when the circulating currents are in loops which then radiate excessive electromagnetic interference into the system causing it to fail. Thinking about it, the only way to destroy this many computers with ground circulating currents, is by corrupting their bios chipsets. Are you sure you are not loading some computer virus onto your systems?