While it is not advisable to leave a computer on in a building that is unattended due to fire hazard concerns, it is also not advised to be constantly turning a computer on and on. What this does to a computer is cause the components to be heated and cooled every time the system is switched on or off. This has been identified as the single biggest factor in component wear. In a working situation computers should probably be switched on in the morning and off in the evening. From your previous work in this course you should by now be able to identify and be reasonably familiar with the basic components of the computer.
Ensure power is off and unplugged from power source.
This can be achieved quite simply with the use of a screwdriver to undo screws from the back of the case. The case should slide off quite simply although as with all aspects of computer maintenance it should NOT be forced. Check to ensure that all screws have been removed if having difficulty. Once again, if any doubt of what goes where, a simple sketch will ensure that it all goes back together properly at the required time. Most adaptors will be connected by a screw to the case cover and by way of expansion slots into the motherboard.