A home computer that has been in operation for more than five years is now suffering from random shutdowns during the day. The PC is set up in an enclosed cubby built into the home office desk…

Switching a computer designed for 120V to 240V operation would likely result in immediate damage to the power supply, not random shutdowns over a prolonged period.

Dust accumulation inside a computer, especially over five years and in an enclosed cubby, impedes airflow and clogs heatsinks, leading to increased internal temperatures. Overheating components, particularly the CPU or GPU, will cause the system to shut down randomly as a self-protection mechanism.

An outdated BIOS is unlikely to directly cause PSU issues leading to random shutdowns after five years of operation; BIOS updates primarily address compatibility or specific hardware bugs, not usually power supply degradation.

Electromagnetic Interference (EMI) typically causes erratic behavior or data corruption, not usually random shutdowns, and an enclosed cubby might even help shield against some external EMI rather than cause it.