If you need to replace the power supply unit (PSU) in your Lenovo laptop, here are the steps to do so. First, you will need to purchase a replacement PSU that is compatible with your specific laptop model. Next, power off your laptop and disconnect it from any power sources. Open the laptop case and locate the PSU, which is typically a small metal box with cables coming out of it. Disconnect the cables from the old PSU and remove it from the laptop. Install the new PSU by connecting the cables and securing it in place. Close the laptop case, reconnect any power sources, and power on the laptop to ensure the new PSU is working correctly.

If you need to replace the power supply unit in your Lenovo computer, you can purchase a new one from various retailers or directly from Lenovo's official website. Ensure that you buy a compatible power supply unit that matches the specifications of your computer model. To replace the unit, first, turn off the computer and unplug all cables. Then, remove the old power supply unit by unscrewing the screws that hold it in place and disconnecting all cables. Finally, connect the new power supply unit and secure it with screws.