Final answer:
Powering on your computer from a completely turned-off state is known as a cold boot. This process involves the content loaded from scratch, with no remnants from previous sessions.
Step-by-step explanation:
Powering on your computer from a completely turned-off state is referred to as a cold boot. A cold boot is when the computer system's power has been completely off and all software programs are closed. The process starts by the operating system loading from scratch meaning all the content loaded into memory is fresh and no remnants from previous sessions are present.
In contrast a warm boot involves restarting the computer without turning off the power usually by pressing the reset button or selecting the restart option from within the operating system which doesn't clear the memory completely and can be quicker than a cold boot.