Replacement or upgrading should include selecting and installing

• case and power supply
• motherboard
• CPU and heat sink/fan assembly
• RAM
• adapter cards
• field-replaceable units (FRUs)
• storage devices
• input and output devices. 

Process/Skill Questions: 

• How might the replacement of one component affect other components?
• What are typical considerations when determining whether to replace a storage device?
• When replacing adapter cards, what is the most important factor to consider?
• What is an FRU?