1. Yes, it is essential; why? Most manufacturer’s instructions are for your safety first and how to properly install a device
2. The safety reason is that, for example, if your printer is still connected to both power and your computer, there is a (slight) shock risk, even if the PC itself is unplugged. Also, unplugging everything helps eliminate the possibility of an accident.
3. The reasoning is that most have to do with RAM efficiency and motherboard processing speed.
Computer Hardware Servicing NCII
Computer Engineer major in Artificial intelligence
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