User Guide

24 - Mac mini Troubleshooting
Symptom Charts
Battery
The computer won’t keep date and time, the date and time reset when the
computer is powered off or unplugged
1. Make sure the electrical outlet works by plugging in a different device, or plug the
computer into a different outlet.
2. Check the power cord. Use a known good power cord.
3. Check the connection of the power cord on both ends. Make sure that the plug is
securely plugged into both the electrical outlet and the back of the computer.
4. Disconnect the keyboard, mouse, and all other peripherals such as speakers.
5. Remove the top housing and if necessary, remove the internal frame.
6. Measure the voltage of the battery in the battery holder (see graphic below). The
battery should measure 2.6V to 3.0V. If the battery does not have minimum voltage,
replace the battery. After replacing the battery, wait 10 seconds and then reset the
PMU (refer to Reset the PMU mentioned in this chapter).
7. If the battery voltage is good, reset the Power Management Unit (PMU). Refer to:
Reset the PMU mentioned in this chapter.
8. If the issue continues after resetting the PMU, replace the logic board.