It should have only two positions: (For 3 pins: 1-2 or 2-3; For 2 pins: Jumper is Closed and Open) To clear CMOS, turn the computer on for 5 seconds after changing ... These slots are about 5 inches long and the memory in rotated into place as if on a hinge along the long side, not inserted straight into the slot. ... Newer motherboards (Pentiums and above) take an ATX power supply instead, shown below.
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