Re: Latitude E6420 won't turn on

Hi johen,

Do you hear Windows sound when you power on the computer? 

You may drain out the residual power and then try using the system:

  • Power off your computer.
  • Please remove the AC adaptor and battery of your computer.
  • Press and hold the power button of your computer for 10-15 seconds to drain out the residual power.
  • Release the power button.
  • Insert the battery in and connect the AC adaptor.
  • Then try powering on the computer. 

Another step you may try is to check if the computer works perfectly fine with external monitor. You may also check the status of diagnostic LED's on your computer. 

Diagnostic LEDFault Description 
Hard drive LED 
Power LED
Wireless LED
Blinking
Solid
Solid
A possible processor failure has occurred.
Solid
Blinking
Solid
The memory modules are detected but has encountered an error.
Blinking
Blinking
Blinking
A system board failure has occurred.
Blinking
Blinking
Solid
A possible graphics card/video failure has occurred.
Blinking
Blinking
Off
System failed on hard drive initialization OR System failed in Option ROM initialization.
Blinking
Off
Blinking
The USB controller encountered a problem during initialization.
Solid
Blinking
Blinking
No memory modules are installed/detected.
Blinking
Solid
Blinking
The LCD encountered a problem during initialization.
Off
Blinking
Blinking
The modem is preventing the system from completing POST.
Off
Blinking
Off
Memory failed to initialize or memory is unsupported.

Please share the findings. 

Thanks and regards,
DELL-Chinmay S
#IWork4Dell 
To know more about Dell’s products, services and drivers & downloads, please go here

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