An administrator identifies that a server is shutting down. The administrator powers up the server and OS loads but after a few minutes it powers down again. Which of the following is the cause?

A redundant power supply failure might prevent the server from powering on or cause instability, but typically not a consistent shutdown after OS load unless the remaining supply is also failing or insufficient.

CPU overheating is a common cause for a server to power on, load the operating system, and then shut down after a short period. Modern CPUs have built-in thermal protection mechanisms that force a shutdown to prevent permanent damage when critical temperatures are exceeded.

Memory failure usually leads to system crashes, blue screens, or inability to boot the operating system, not a consistent shutdown after the OS loads successfully.

Hard disk failure typically prevents the OS from loading, causes file corruption, or leads to system errors, rather than a consistent shutdown after the OS has started running.