1. An external 12V DC power supply to the test card, and plug in the corresponding motherboard PCI-E slot. 2. the contact switch on the test card, the the test lights turn on the test card all lit, if the light does not shine, should check Southbridge pin open or short circuit isolation capacitance is damaged. 3. PCI-E test card is mainly used to repair computer motherboards do not work (digital card shows FF or not show), job insecurity, the failure of the motherboard video card does not display colour:Green Material:Metal, plastic Package Contents: 1 x Check card Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.