Pressing the turn on button may start the fans on the motherboard for a bit, but you will see no display at all. On certain systems, you will notice that the PC will simply not start. You Will See Error on the POST Screen on StartupĪ failing CMOS battery can have different effects on different PCs.You Will See Flashes of LED on Motherboard.The following are thus signs of a failing CMOS battery: There are a few things that can happen if your CMOS battery dies or if its failing. The CMOS battery is a CR2032 coin-cell battery and it is universal across all motherboards.Ī new battery is estimated to last for around 3 years if the PC is not plugged into the wall socket. Therefore, even when the PC is turned off or when plugged out from the wall socket, the motherboard retains the clock, date and the critical hardware information.Ī CMOS battery is fairly hard to miss. Similarly, if something goes wrong with CMOS, then your PC will simply not start.Ī CMOS battery is basically what powers the CMOS chip. If the ignition switch is faulty, the car will simply not start. Think of CMOS as ignition switch on a car. This seemingly menial chip is essential to the working of your entire PC. Fixing the Problem – Replacing the BatteryĬMOS or Complementary Metal Oxide Semiconductor is basically a battery powered chip located on the motherboard that holds critical system information such as the Real Time Clock (RTC), date as well as hardware information.So What Happens When CMOS Battery Dies?.
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