Accounting Book

8.3.2.2. Data Cable 
These are usually flat ribbon cables. They have normally the following number of wires:
 Floppy disk drive: 34 wires
 Hard disk drive: 40 or 50 wires
 CD drive: 40 or 50 wires.

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A dark line on one side marks these cables. While the cable is connected with the drive, note the direction of the dark line, if it towards the power cable or in opposite direction.

8.4. Remove the Power Supply

In the previous steps motherboard and drive connections with the power supply unit are disconnected. Now the screws those hold the power supply unit with the chassis should be removed. There are four screws in the back of the chassis. The on-off switch of the power supply unit is at the front side of the chassis. To remove the power supply unit from the chassis this switch should also be removed.

8.5. Remove the Motherboard 

The motherboard leis flat in the bottom of the chassis. To remove the motherboard you should do: 

 Remove the expansion boards and cables (This is done in previous steps). 

 Remove the screws and plastic spacers those hold the motherboard with the chassis. 

 Lift the motherboard out of the chassis. 

In some cases the motherboard is connected with a steel plate and the plate is connected with the chassis by some screws. For this type of chassis it better to remove the plate from the chassis first then open the motherboard from the plate.