A customer reports that their desktop PC restarts on its own about 30 minutes after every cold boot. The pattern is consistent whether the system is idle or running light applications. What is the BEST first course of action to troubleshoot the problem?
Verify that all cooling fans are operating and unobstructed
Replace the CPU with a model that has a lower Thermal Design Power (TDP)
Purchase and install a higher-wattage power supply
Consistent, timed shutdowns or restarts strongly suggest an overheating condition rather than a sporadic power or battery problem. Overheating most often results from inadequate airflow caused by failed or obstructed fans, clogged heat sinks, or dried thermal compound. The appropriate first step is to inspect and confirm that all cooling fans (CPU, chassis, and power-supply fans) are spinning freely and that vents are clear. If fans are stalled or obstructed, correct the cooling issue before considering replacement parts.
A power-supply replacement could solve random restarts caused by voltage drops, but it should not be attempted until overheating has been ruled out. A CMOS battery error generally manifests as lost BIOS settings or wrong system time, not timed restarts. Upgrading to a lower-TDP CPU might reduce heat, but replacing a major component before basic diagnostics is neither cost-effective nor aligned with best practices.
Ask Bash
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
What are the most common signs of an overheating PC?
Open an interactive chat with Bash
How do you inspect if a cooling fan is functioning properly?
Open an interactive chat with Bash
What is Thermal Design Power (TDP) and why does it matter for CPUs?