Teledyne LeCroy Hot Swapping PCI Cards - Manual (Page 13)

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Computer crashes when the extender power switch is turned OFF.
A. This can occur if the ICs on the extender card have been damaged and have internal leakage, This leakage
can cause some of the signals to be shorted to ground, VCC, or to each other.
B. The UUT is being used, by the system software, at the time the extender power switch is turned off the
software is looking for the board and system hangs when it can not find the UUT board.
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Computer crashes when the extender power switch is in the OFF position and a new UUT is inserted.
This can occur if the extender card is damaged, and some of this signals are not fully turned off.