by 
The Curious Bag
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<h4 class="dechead">On One Hand: A Market Exists
Your old computer might not work for you anymore, but there are many people who need a basic, simple machine. Old computers are often sold through classified ads or online auction sites. Research recent sales to determine the price range for similar computers.
On the Other: Security is a Concern
Deleted files can be recovered from hard drives in many cases. If you decide to sell your old computer, purchase a utility that will completely erase your hard drive. For absolute peace of mind, your best bet is to physically destroy the hard drive--smash it with a hammer, for example--and sell the other computer parts individually.
Bottom Line
You can sell your old computer, but be sure to remove all of your personal information before you do. Taking your computer apart to sell individual components, rather than a complete unit, might be more profitable and secure.
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