Troubleshooting Your System 165Troubleshooting the System BatteryNOTE: If the system is turned off for long periods of time (for weeks or months), theNVRAM may lose its system configuration information. This situation is caused by adefective battery.1 Re-enter the time and date through the System Setup program. See "Usingthe System Setup Program and UEFI Boot Manager" on page 57.2 Turn off the system and disconnect it from the electrical outlet for at leastone hour.3 Reconnect the system to the electrical outlet and turn on the system.4 Enter the System Setup program.If the date and time are not correct in the System Setup program, replacethe battery. See "System Battery" on page 144.If the problem is not resolved by replacing the battery, see "Getting Help"on page 193.NOTE: Some software may cause the system time to speed up or slow down. If thesystem seems to operate normally except for the time kept in the System Setupprogram, the problem may be caused by software rather than by a defectivebattery.Troubleshooting Power Supplies1 Identify the faulty power supply by the power supply's fault indicator. See"Power Indicator Codes" on page 24.CAUTION: In a rare case of multiple fan failure, the system continues to operatewith at least one functional fan. However, running the system without replacingfailed fan(s) for extended duration is not recommended.2 Reseat the power supply by removing and reinstalling it. See "PowerSupplies" on page 81.NOTE: After installing a power supply, allow several seconds for the systemto recognize the power supply and to determine if it is working properly. Thepower indicator turns green to signify that the power supply is functioningproperly.If the problem persists, replace the faulty power supply.3 If the problem persists, see "Getting Help" on page 193.
