Computer Hardware
You run a super wing-ding diagnostic program on your PC, and it reports that your hard drive, microprocessor, RAM, and video card have seen better days. To resolve this problem you should:

get another copy of the diagnostic program
run an exhaustive memory check
check to see if you have a software problem
replace each part one at a time, rerunning the diagnostic before replacing the next part.
replace everything at once and rerun the diagnostic

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Computer Hardware
One of the major components of a PC is the Central Processing Unit (CPU) which can be best described as:

The device that sends the monitor signals telling it what to display
The area where all of the processing takes place
The area where ail the of the Basic input/output routines are stored
The area that regulates all of the system power usage

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