First, be sure to draw off any static electricity that may be built up on your hands before you touch a sensitive part. You should touch the metal PC case before touching the components. Metal will draw off any built-up charge. Even if you wear a grounding wrist strap, touch the PC case anyway as an extra precaution. Touching the case’s power supply is usually recommended, because some say that touching a heavily painted case will sometimes fail to draw off the charge. The power supply is unpainted metal that is always grounded.
Second, touch the parts where they’re the least sensitive to being harmed by ESD. Pick up mainboards by the edges.see figure . Pick up PCI cards by the metal part that attaches them to the back of the case and then handle them by the edges. See Figure, Try to handle all sensitive parts by the edges.
Holding a mainboard properly, by the corners
Holding a PCI card properly, by the metal and the edges
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