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I also have the same problem after updating the BIOS. The screen goes to sleep and cannot wake up no matter what key I pressed. I had changed the power setting and no result has happened

@rsjohn1285 

Hi,

I had the same issue and managed to fix it, go to Dell optimizer, press on the proximity sensor, and turn "Walk Away Lock" OFF. That should do the job.

In addition, you should increase the time until your computer sleeps in regular settings while plugged in.

This response is late, but I spent two weeks on this issue. Hopefully, this will save someone else time when they stumble into this. 

About half of the Dell Precisions 7750s I have worked on have this issue during their lifecycle. The symptoms: Computer is on, keyboard and lights will be on, screen is black and will not wake no matter what buttons your press. A reboot temporarily fixes it, but will immediately revert back to the black screen.

Solution: There are two magnets located inside the laptop that tell the display when the lid is shut. When loose, the lid stays in the "shut lid" state. Move these magnets back to their slots or remove them entirely. The screen lock will still perform with one of these two magnets. (Location and size of magnets vary between dell precisions)

1. Open the cover off of the bottom of the laptop.

2. Locate the two magnets on each bottom right and left corner.

3. Ensure these magnets are in their respective slots. You can tell if they have moved if there is wiggle room, or they are crooked.

4. Remove the magnet(s) that are loose, or push them back into their slots.

Hey guys,

I have removed 1 right side magnit from precision 7550 and the screen has started to work normally. What should be I aware of, will system work unstable, anything to be worried about without this magnit piece ? 

Thanks,

-VB