Basic Input and Output Systems (BIOS) instructions are found on the Read Only Memory (ROM) chip, which responds to the processor when started. If nothing happens when the power button is pushed, the Nurse Informaticist knows to check the: (comments for answer and rationale)
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The power source to the computer
The processor responds to a signal generated by the power supply, which then finds the BIOS to perform a “power on” self-test.