Electronic components are very often highly sensitive to ESD, or ElectroStatic Discharge. Static electricity in your body, even if you are not aware of it, can easily damage a component beyond repair. When performing system component upgrades or maintenance it is advisable to perform the following antistatic precautions: *Use a grounding wrist strap. These are supplied by most electronic stores. * Keeping in contact with the metal frame of the computer is fine as long as it is earthed (plugged into an earthed socket but switched off at the mains). * Handle circuit boards by the edges and avoid touching the contacts or components themselves. Remember! The damage may not become apparent until you actually try to use the damaged component. I apologise if I appear a little patronising but I suspect some system failures that I have read in these forums are due to a lack of taking the proper precautions.