PC smells like it's burning

Symptoms

• A distinct burning, hot plastic, or electrical smell coming from the case
• Smell appears suddenly or gets stronger during use
• No visible smoke, but the odor is unmistakable
• Smell is localized to one area when you get close (fan, power supply, GPU)

Likely causes

• PossibleDust or debris burning off a component that's running hotSometimes a one-time buildup burning off produces a smell without ongoing damage.
• PossibleA failing capacitor or electronic component overheatingThis can precede a component failure and is a genuine hardware fault.
• PossiblePower supply internally failingA failing PSU can produce a burning smell as components inside degrade.
• PossibleA fan or cable in contact with a hot surface, like a heatsinkPhysical contact can slowly melt plastic and produce a burning odor.

What to do

1. Power off the PC immediately and unplug it from the wall.
2. Do not turn it back on to 'see if it happens again' until you've inspected it.
3. Once cool, open the case and visually check for scorch marks, melted plastic, or a component that looks discolored.
4. Check that no cables are resting against a hot heatsink or exhaust vent.
5. If a specific component (like the power supply) seems to be the source and shows any visible damage, do not use it again.
6. If no obvious cause is found but the smell was real and distinct, have the PC inspected by a professional before continuing to use it.

When to call a pro

If you can't find an obvious cause, or find any sign of scorching or melted components, have a professional inspect the PC before using it again.

Safety