Computer Overheating
The case feels hot, fans run loudly and constantly, and the computer may slow down, freeze, or shut down unexpectedly — particularly under any sustained load like gaming or video work.
Quick answer: Desktop overheating is most often dust buildup restricting airflow through the case and fans, followed by dried-out thermal paste on an older build. Clearing dust from vents and fans is the first and easiest thing to check before assuming a component has failed.
Likely causes
- Dust buildup on fans, heatsinks and vents restricting airflow
- Dried-out thermal paste on the processor, reducing heat transfer efficiency over time
- Poor case airflow — too few fans, or fans positioned so they fight each other
- A fan that's stopped working or is running slower than it should
What you can safely check yourself
- If comfortable opening the case, check for visible dust buildup on fans and heatsinks
- Make sure the case has clear airflow — vents not blocked by walls, furniture or clutter
- Listen for fans that sound like they're struggling, rattling, or not spinning at all
When it needs a proper look
If the computer shuts down under load even after clearing visible dust, it's likely time for a proper internal clean, thermal paste replacement, or a check of the fans themselves.