Believe it or not most people do not understand that a plastic hose on a vacuum cleaner creates more static electricity than a metal hose does. The action that creates static electricity is the movement of 2 insulators (non cunductive components) moving against each other. Air is an insulator and so is the plastic. This is the generator of static electricity. This is why when you rub a balloon across your hair or your shirt you can hang the balloon on a wall or a pane of glass. Because the static electric charge holds it there. Also why walking across a carpet in rubber soled shoes will cause a shock when you touch a door knob. Using a vacuum inside of a computer is a dangerous situation waiting to discharge itself. There are very expensive vacuums designed for the internals of sensative electronic equipment. But unless you have a few thousand dollars for one most people will never see one. THe static charge generated by a standard household vacuum is actually thousands of volts at a very miniscule amperage. and that could easily destroy components on your motherboard.