Re: my dell latitude e6420 screen goes blank when it has to boot

Hi notyme,

Welcome to the Community.

Unplug the adapter and the battery. Press and hold power button for 20 seconds. Plugin the adapter. Press and hold “Fn” key while turning on the system. Hold it down until the diagnostic starts. For more information click the link mentioned below:

Please refer to the link mentioned below for information on error codes:

Thanks & Regards
Manshu S

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