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9.3.2. Finding the Pin-1
To find the pin-1 of the connector slot of the motherboard (or I/O card) look carefully on the side of the slot. In most of the motherboards you will find a ‘1’ marked near the slot. The near most pin with this ‘1’ mark is the pin-1. The disk drives have two slots – one for power and another for data.

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Power cable is easy to insert because to insert it in opposite direction is not possible. To insert the data cable you need to find the pin-1 in data cable slot. The pin of the data cable slot, which is near most to the power cable slot, is the pin-1. So you have to insert the data cable in such a way that the dark line on the cable (i.e., wire-1) is near the power slot. 

9.4. Common Reassembling Mistakes 

Many mistakes may happen during assembling process. If you assemble the components with patience and have a good diagram then most of the problems can be avoided. Some common mistakes during assembly are discussed here. 

9.4.1. Forgetting to Connect the Power Cables P8 and P9 

This isn’t actually common, but it's important. If you forget to connect the motherboard power connectors P8 and P9 to the motherboard, the power supply may actually explode when you turn the machine on. 

9.4.2. Bad Motherboard Seating 

Pay special attention when reseating the motherboard on its plastic spacers. Notice that the spacers are designed with a top disk and a bottom disk, and a bit of space between. Then notice that the motherboard has raised metal slots with a V shape. The spacers are supposed to sit so that the V is between the upper and lower disk. Get a flashlight and check the spacers. Another way to test motherboard seating is to insert a circuit board-if it doesn’t fit right, your motherboard is probably seated wrong. In a related issue, make sure that the motherboard isn’t string right on the metal case; there must be a bit of airspace between it and the case, or you short-circuit the board for sure.