Another issue I see a lot, is people with bad power adapters. Improperly wrapping your power adapter, or not wrapping it at all can lead to problems. These include exposed wires, intermittent power to the laptop, and shorts. A replacement adapter can easily cost $65 to $120.
The best way to protect your cables is to wrap them properly. In each step I show a different type of power adapter.
Step one, a power adapter with a large Velcro or rubber strap.
Step two, a power adapter with no Velcro or rubber strap.
Step three, a power adapter with two small Velcro straps.
Step four, a power adapter with one small Velcro strap.
Step five, a very small power adapter with no Velcro or rubber straps.
For those living in a country where they do not sell Velcro, Velcro is commonly sold as "hook and loop fasteners". I use the name "Velcro" in this Instructable, because it is easier and shorter than "hook and loop fastener", and people in the United States usually just say "Velcro".
If you have a different power adapter that I missed, please feel free to send me a private message either describing your power adapter, or sending me a picture of the adapter. I will update this to include your power adapter.