Sometimes, computer parts are needed that you can't just go over to Radio Shack and buy; they have to be ordered, and then, you have to wait for them to arrive.
What if your computer is super-messed up and requires extended repair time? Can you make it without your computer for a day, or days? Can you get by without your computer for a week, or longer?
If you have another computer to use, then these potential problems are not problems at all and the low cost of having a second computer might surprise you. Good, used computers can be had for not much money, and may be all you need to get you through until your main machine is fixed.
I sell them, eBay sells them, lots of people sell used computers. Depending on your needs, a used computer standing by to be used when needed is cheap insurance.
Along the same lines, if you use a laptop or tablet computer, have you thought about what you would do if your power supply/battery charger failed (you know, the cord that goes from the laptop and plugs in the wall)? When your laptop battery runs down, what will you do?
Think about buying a "backup" charger to use. The best prices for laptop battery chargers can be found online; Amazon is a good source for these items.
For example, go to Amazon.com and type the name and model number of your laptop (i.e., "Dell M1530" or "Macbook Pro A1260") into the search box, followed by the words "battery charger," and see what you can find. I just found one for my laptop, and it's only $10. What a deal!
Dave Moore has been performing computer consulting, repairs, security and networking in Oklahoma since 1984. He also teaches computer safety workshops for public and private organizations. He can be reached at 405-919-9901 or www.davemoorecomputers.com.