The CPU is arguably the most complicated component inside of a computer, with modern processors having over 2 billion transistors stuffed into the space of an over-sized postage stamp, although some video cards are also approaching that level of complexity as well.
The Motherboard i think or maybe the processor.
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the computer component not tested by post rutine is the power supply
The computer component that presents the most risk of electric shock is the power supply. Since there are large capacitors in the power supply, it is possible that you might get shocked, even with the power supply unplugged.Another component that presents a shock risk is an internal modem. You might grab a hold of it while there is an incoming phone call, and then get shocked from the ringer current.
The component that must be compatible with every other component of the computer is the motherboard. Your computer will not function properly without them being compatible.
A laptop if you want a complete computer that you can carry around (there is a CPU in a laptop)A CPU if you have a computer and want to upgrade or replace the "Central Processing Unit" which is the most expensive and complicated component.
Yes the CPU (aka microprocessor or Central Processing Unit) is the most important, but it is not necessarily the most expensive.
The Motherboard i think or maybe the processor.
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hard drive
A computer component would be part of the computer itself. Devices can be separate to a computer and just connected to it.
the computer component not tested by post rutine is the power supply
Life was complicated long before computers came along. It is complicated now with or without a computer. Truth be known, complication is intrinsic to the human condition.
client/server application
The anwers is not avalible!!
Video Card.
Ram