The following article deals with explaining why there is no hardware fault at work when you connect a Precision Mobile 7510 and 7710 and external monitors together via a DisplayPort connection and a simple E-Port Dock and there's no Pre-Boot video seen on screen.
This article is specifically about the Precision mobile 7510 and 7710 systems. When docked to an E-port dock and using external monitors via DisplayPort, these systems do not show any video during the pre-boot environment.
Pre-Boot Environment: This covers the period from POST through the Dell Splash Screen through to the Windows Operating System (OS) starting up. It includes those intermediate screens such as the F12 menu and the BitLocker Prompt.
An external monitor connected via DVI does not experience the same lack of video.
This situation only occurs on a Precision Mobile 7510 or 7710 using external video through a DisplayPort connector on a simple E-Port Dock. You do not see this if you use another display connector type or if you use the advanced E-Port dock. (The E-Port+).
This is not a fault or issue with the hardware. It is each of the hardware parts working as designed. I'll explain how below:
Fig.1 Precision Docking Station Port.
Fig.2 Simple E-Port Dock
Fig.3 Advanced E-Port Dock
There are three quick things you can change to stop this from occurring: (Any one of the three options would work.)
Article ID: SLN305432Last Date Modified: 09/14/2019 09:23 AM