Big Blue expects to remanufacture 100, 000 servers and personal computers a year by 2014 by installing new memory and storage and packaging them for resale to the domestic Chinese market.

FORBES: IBM Opens China's First Factory To Refurbish Old Computers, Tapping A $2 Billion Market

Another key to a healthy computer is making sure you have enough memory before installing new applications.

CNN: dotCOM Tools: Healthy PCs

Jim Mochanz, who worked for 10 years installing mobile phone masts, told BBC Radio 4's Today programme he now suffers from memory loss and mood swings.

BBC: Volunteers to test phone safety