![]() ![]() Or, your customized keyboard configuration has reset to the default one. Or, your peripherals could be thrown out of whack your cursor is inaccurate and your key inputs prompt strange responses from the operating system. It’s possible that your peripherals don’t respond - you can’t move your cursor or click on any icons or the laptop won’t read any of your keyboard inputs. So if the date and time have mysteriously reset, that’s a very good sign that the CMOS battery died. CMOS (which is sometimes referred to as a real-time clock, in and of itself) is responsible for maintaining that procedure. Even when your computer is shut off, BIOS maintains a real-time clock that tracks the date and time. Most likely, they’ve reset to a date long in the past. If your laptop manages to boot, you might notice that the date and time have reset. You also might hear a constant beeping noise from the motherboard, another indication of a battery failure. Without the battery, your laptop may have a very difficult time booting up or it may not boot up at all. Īs we mentioned previously, BIOS is largely responsible for booting up your computer. When your CMOS battery fails, your BIOS firmware will shut down and revert to its default settings.
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