A desktop user reports that every time the PC is unplugged overnight the date reverts to January 1, 2016 and any custom BIOS settings-such as boot order and fan curves-have disappeared when the system is powered back on. No other hardware changes have been made, and the computer otherwise starts and runs normally once the date is corrected in Windows. According to best-practice troubleshooting, which action should you try first to correct the underlying issue?
Resetting the system clock in Windows
Pointing the PC to a different network time (NTP) server
Because the system is losing both date/time and custom firmware settings whenever AC power is removed, the most likely root cause is a depleted or faulty CMOS/RTC battery. Replacing that inexpensive coin-cell battery restores standby power to the non-volatile memory that stores BIOS data, preventing further resets. Simply changing the clock or updating firmware would not address the loss of power to the configuration memory.
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CompTIA A+ 220-1101 (V14)
Hardware and Network Troubleshooting
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