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220-1101 · Question #802

A user reports that, despite manually changing the date and time on a computer, the changes always revert after the computer is turned off for a period of time. Which of the following should the techn

The correct answer is B. CMOS battery. When a computer fails to retain date and time settings after being powered off, the CMOS battery, which powers the real-time clock and BIOS/UEFI settings, is the most probable cause of the issue.

Hardware and network troubleshooting

Question

A user reports that, despite manually changing the date and time on a computer, the changes always revert after the computer is turned off for a period of time. Which of the following should the technician consider first?

Options

  • AOS updates
  • BCMOS battery
  • CNTP server
  • DRAM

How the community answered

(23 responses)
  • A
    9% (2)
  • B
    87% (20)
  • C
    4% (1)

Why each option

When a computer fails to retain date and time settings after being powered off, the CMOS battery, which powers the real-time clock and BIOS/UEFI settings, is the most probable cause of the issue.

AOS updates

OS updates primarily affect software and system functionality, not the retention of basic hardware-level settings like date and time when the system is powered off.

BCMOS batteryCorrect

The CMOS battery provides power to the complementary metal-oxide-semiconductor (CMOS) chip on the motherboard, which stores the BIOS/UEFI settings, including the system date and time. If this battery is dead or weak, the system will lose its time and date settings whenever the main power is removed, causing them to revert to default or incorrect values.

CNTP server

An NTP (Network Time Protocol) server is used to synchronize the system's time with an external source when the computer is running and connected to a network, but it doesn't address the loss of time settings when the computer is off.

DRAM

RAM (Random Access Memory) is volatile memory used for active data and programs; it has no role in retaining date and time settings when the computer is turned off.

Concept tested: CMOS battery function

Topics

#CMOS battery#Troubleshooting#RTC#BIOS/UEFI

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