Immediately after you unplug the computer from the power outlet, you're safe to begin working inside the case.

Question

Quizplus · Accepted Answer

Even after unplugging the computer from the power outlet, there could still be residual electrical charge in the system. Therefore, it's important to press the power button or hold down the power button for a few seconds to discharge any remaining charge before opening the case.

Immediately After You Unplug the Computer from the Power Outlet