All monitors display 2-inch high letters. Those that don't will have incredibly powerful text-based command shells that can correctly understand and execute commands typed in plain English. Viruses cause temperatures in computers, just like they do in humans. Eventually, smoke billows out of disk drives and monitors. All computers are connected, so you can access the information on the villain's desktop computer, even if it's turned off.
Powerful computers beep whenever keys are pressed or the screen changes.
They also slow down the output on the screen so that it doesn't go any faster than the audience can read it. All computer panels have thousands of volts and flash pots just underneath the surface. Malfunctions are indicated by a bright flash, a puff of smoke, a shower of sparks, and an explosion that forces you backward. People typing away on a computer always turn it off without saving the data. A hacker can get into the most sensitive computer in the world before intermission and guess the secret password in two tries.