Which action should be avoided when working inside a computer case?

Wearing loose clothing should be avoided when working inside a computer case because such attire can inadvertently catch on components or tools, posing a risk of damage to the hardware or injury to the technician. Tight-fitting clothing is preferable as it minimizes the chance of snagging on any sensitive parts and enhances overall safety while performing any repairs or modifications.

Using a grounding strap, disconnecting power before servicing, and removing jewelry are all best practices that help protect both the technician and the equipment. Grounding straps prevent static electricity from damaging components, disconnecting power ensures that there's no live electricity when working on internal parts, and removing jewelry helps avoid potential short circuits or physical injury from rings and watches getting caught in moving parts.