Regular checking will ensure that the problems of wiring getting a bit worn, won't affect your machine negatively. Getting into the habit of doing this every month will avoid a nasty surprise later. Last of all, I keep a very excellent surge suppressor between my wall plug and my computer equipment. This is probably one of the most important things you can buy to keep your computer healthy. Spending the kind of money it takes to have a complete system makes no sense, if you don't spend as much as you can afford to protect it from electric spikes and surges.
Surge suppressors come in all sizes and types.
One factor to keep in mind is the number of the Joules rating. The higher the Joules rating, the better the protection. You are putting a surge suppressor in between the wall and your equipment to prevent large spikes or surges of electricity, whether from lightening hitting a pole down the street or the electric co mpany having a slight surge going through the lines. There are different types of suppressors on the market, but if you look for one that offers insurance protection, lightning protection, and has a high Joules rating, you should be able to keep your computer from ever getting zapped.