The day that the lights went out

You’ve been using a computer to surf the ‘net, but it has suddenly stopped all communication over the network. When you look at the network connection, you don’t see any status lights. What is the most likely cause of this issue?

Why doesn’t it work?

Your computer’s hard drive failed, so you purchased a new hard drive and installed it. When you start the computer, you see the message “Operating System not Found.” Which of these orders of steps should you use to get your system back up and running?

CompTIA A+ 220-701: 1.10 – Laptop Power Technologies

Laptop computers are the ultimate portable computing device, and their portability means that you’ll need to use many different power sources. In this video, you’ll learn about fixed input power supplies, auto-switching power supplies, and battery technologies.