According to the [link|https://www.dell.com/support/manuals/en-in/latitude-5420-laptop/5420_sp14_sm/system-diagnostic-lights?guid=guid-8a701316-1175-4697-9c8a-1847a8757544&lang=en-us|Dell Support page|new_window=true] that beep code is consistent with a Power Rail failure and the solution for that would be to replace the system board which isn't the most pleasant answer, however I did see that a few users on Reddit had success resetting their RTC, now this very well may not work but it wouldn't hurt to try before replacing the Motherboard on the computer.
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According to the [link|https://www.dell.com/support/manuals/en-in/latitude-5420-laptop/5420_sp14_sm/system-diagnostic-lights?guid=guid-8a701316-1175-4697-9c8a-1847a8757544&lang=en-us|Dell Support page|new_window=true] that beep code is consistent with a Power Rail failure and the solution for that would be to replace the system board which isn't the most pleasant answer in the world, sorry about that. I did however see that a few users on Reddit had success resetting their RTC, now this very well may ***not*** work but it wouldn't hurt to try before replacing the Motherboard on the computer.
''How to [link|https://www.dell.com/support/kbdoc/en-us/000125880/how-to-reset-real-time-clock-rtc-to-recover-your-dell-portable-system|reset RTC|new_window=true] ''
=== How to Reset the Real-Time Clock (RTC) ===
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# ***Turn off*** the computer.
# ***Connect*** the AC adapter to the computer.
# Press and hold the ***power button*** (around 30-35 seconds), until the power LED blinks three times.
# ***Release*** the power button.
# The RTC reset is complete after the power button is released.
According to the [link|https://www.dell.com/support/manuals/en-in/latitude-5420-laptop/5420_sp14_sm/system-diagnostic-lights?guid=guid-8a701316-1175-4697-9c8a-1847a8757544&lang=en-us|Dell Support page|new_window=true] that beep code is consistent with a Power Rail failure and the solution for that would be to replace the system board which isn't the most pleasant answer, however I did see that a few users on Reddit had success resetting their RTC, now this very well may not work but it wouldn't hurt to try before replacing the Motherboard on the computer.
''How to [link|https://www.dell.com/support/kbdoc/en-us/000125880/how-to-reset-real-time-clock-rtc-to-recover-your-dell-portable-system|reset RTC|new_window=true] ''
=== How to Reset the Real-Time Clock (RTC) ===
# ***Turn off*** the computer.
# ***Connect*** the AC adapter to the computer.
# Press and hold the ***power button*** (around 30-35 seconds), until the power LED blinks three times.
# ***Release*** the power button.
# The RTC reset is complete after the power button is released.