The first step is to decide what laptop computer you want. Remember you are looking for a used laptop, so forget about the latest sexy Apple Macbook Air. Go for last year's model instead. These should function perfectly well and to be honest, I think they will be any computing task equally well.

The next thing to do is to hunt for a place to buy the used laptop. Some suggestions: eBay, Craigslist, local dealers, or even straight from the manufacturer. Now, if you buy refurbished models from the manufacturer or a local dealer, expect to pay a bit more. However, these usually have warranties which make them a bit safer. If you want to use Craigslist or eBay, be sure to find a good seller (on eBay that means no less than 100% feedback rating).
 

There are many places to buy used laptops

Once you've got a seller, check the laptop to make sure that there is no damage. Cosmetic issues may not be an issue, but usually what is more serious are faulty components. So make sure you switch on the laptop and run some standard application like Microsoft Office to make sure they work.

Check the display extremely carefully. The display screen is easily one of the most expensive things to replace on a laptop. Check for defective pixels, dead pixels and discoloration over every inch of the screen.

You will also need to plug in and check all the plugs, sockets, USB ports, audio jacks and wireless connections. That includes Bluetooth and Wi-Fi. Many folks don't bother to check these and in the end go home and find they cannot connect to the Internet.
 

Make sure you test those laptop ports and connections

Check for funny noises coming from the hard drive. If you hear regular whirring noises, it is an indication of a problem. Hard drive errors are very dangerous and difficult to solve, so check carefully before you buy.

Another check I propose you do is to check the battery life. One of the most common problems is a battery that doesn't last beyond say 5 to 10 minutes. Many, many used laptops have faulty batteries so make sure you get the unit at a cheaper price or avoid the purchase altogether if you find a defective, short-life battery.