A user reports that their desktop computer shuts down abruptly at random times. After talking to the user and performing some basic checks, you form a theory that the power supply might be failing. You then verify the theory by using a multimeter to test the outputs of the power supply and confirm that the voltages are inconsistent. What is the NEXT step you should take to resolve the problem?
Upgrade the BIOS/UEFI firmware as it could be causing power management issues.
Perform a system restore to a previous point when the computer did not shut down.
Reboot the computer and run a virus scan.
Replace the power supply unit with a new, properly rated unit.