Question

you work at a computer - repair store. you just upgraded the processor (cpu) in a customers computer. the computer starts, but it locks up shortly after starting windows. which of the following is most likely causing the computer to automatically shut down?
the cpu is bad
the fan is not running
the computer has a virus
the cpu is not supported by the bios

Explanation:

When a computer starts but locks up shortly after starting Windows, a common cause is over - heating. The fan is responsible for cooling the CPU. If it's not running, the CPU can overheat and cause the computer to shut down automatically. A bad CPU would likely prevent the computer from starting properly in the first place. A virus usually doesn't cause an immediate shutdown right after startup. If the CPU is not supported by the BIOS, the computer may not start or may give an error during the boot - up process, not lock up shortly after starting Windows.

Answer:

The fan is not running.