Upon noticing smoke and a strange odor from a computer, what is the most important immediate action to take?

The most important immediate action to take upon noticing smoke and a strange odor from a computer is to shut off the system immediately. This step helps to quickly cease any ongoing electrical activity that could pose a fire hazard or cause further damage to the components. By turning off the system, you reduce the risk of sparks or flames worsening, which is critical in preventing a potential fire.

Addressing the situation without delay ensures safety as smoke and odors can indicate overheating or failing components. Prioritizing safety is essential in this scenario, and shutting off the system is a quick method to mitigate risk.

While disconnecting the power source is also a vital safety measure, it requires more action and time, which can increase risk if the situation is already hazardous. Opening the computer case or calling the fire department could come after ensuring the system is not operational, as the immediate threat of fire needs to be tackled first.