The mainboard needs to be replaced.  
Hello, I am trying to get help in figuring out if a Latitude 7424 Rugged Extremethat will not turn on, can be fixed with no parts being replaced. Below are they symptoms:1. Click power button, and light stays solid green for about 5 seconds, thenshuts off. Battery indicator does recognize that batteries are inserted.or2. Click power button, and light stays solid green for about 4 seconds,blinks, then shuts off at the 6 second mark. Battery indicator doesrecognize that batteries are inserted. Below is what I have tried to remedy the failure, and which leads to thesame symptoms listed above once I try to power it back on: 1. Ensured that power supplies are good, and that batteries are good andcharged (Still fails). 2. Press "D" key while holding on power button to ensure display turns onand goes through its self-test (Screen test good, and fan turns on towards end of display test). 3. Removed batteries and tried with just power supply (Still fails). 4. Removed power supply and tried with just batteries (Still fails). 5. Removed power supply and batteries, and held down power button for 10, 15, 20, 25, and 30 seconds (Still failed each time). 6. Reconnected just the power supply (Still fails). 7. Disconnected power supply and held down power button to drain residualpower (Still fails). 8. Re-inserted just the batteries (Still fails). 9. Opened it up in an ESD safe workbench, and disconnected the BIOS battery,and held down the power button for 30 seconds (Still fails). 10. Removed NVMe (Still fails). 11. Removed RAM (Still fails). Any advice would be appreciated. Thank you.
Latitude 7424 Rugged Extreme