If you have a computer in your home, you probably have at least one other device that works alongside it, such as a modem, wireless router, or printer. These devices have a tendency to stop working from time to time, and it's not always immediately clear why.
Before assuming anything is actually broken, you should try to run a power cycle. To do this, you'll want to turn the device off, then turn it back on. This will force it to reset, which can fix a lot of basic problems.
Here are the steps to power cycle just about any device:
One other thing to note: If you're resetting devices that work together, like a modem and wireless router, you'll want to power cycle them at the same time.
Running a power cycle won't fix more serious problems, but if you have a device that's not working correctly, it's a good thing to try first. If power cycling doesn't seem to help, you'll want to do some more troubleshooting. Check out our lesson on basic troubleshooting techniques to learn how.