Latitude 7420/Latitude 7420 2-in-1 Service Manual
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you to recover Dell computer from No POST, No Power or, No Boot like situations. There is no coin-cell battery on this computer, the main battery reserves 2% of its capacity for RTC function.
How to Reset the Real-Time Clock (RTC)
- Start the RTC reset with the computer powered off and connected to AC power.
- Press and hold the power button for thirty (30-35) seconds.
- The computer RTC Reset occurs after you release the power button.
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