Final answer:
When installing a CPU, a key safety precaution is to use an anti-static wrist strap or touch grounded metal to avoid electrostatic discharge, which can damage the CPU.
Step-by-step explanation:
One safety precaution you should take when installing a CPU is to ensure that you are properly grounded to prevent electrostatic discharge (ESD). ESD can damage the sensitive electronic components of the CPU, potentially rendering it inoperable. Before handling the CPU or any other internal components, it is recommended to use an anti-static wrist strap or touch a grounded metal object to dissipate any static charge that may have accumulated on your body. Additionally, you should handle the CPU by the edges without touching the pins or connectors to minimize the risk of physical damage.