Life Cycle of a Computer

 The averge lifespan of a computer is 4-5 years depending on the brand.

Usually a computer will stop working because of its battery or its a a part of the hardware fails, though it is more common for the software to fail.

To expand you computers life you should avoid leaving in exterior devices like cd or dvd players if you are not using them. Also try to use the screen on low brightness it will help maintain your computer.

To recycle and dispose a computer safely you should erase all of the memory ALL of it. The hardrive everything that way it is safe to dispose.

http://www.makeuseof.com/tag/20-ways-to-increase-the-life-of-your-laptops-battery/
http://www.makeuseof.com/tag/computer-dies-learn-parts-fail/
http://www.digitaltrends.com/computing/how-to-recycle-your-old-computer/