Dead screen, laptop locked in Safe Mode with no HDMI driver for external monitor

Hi,
Background: This is a Windows 8 pre-loaded notebook, I have updated to 8.1 (some months ago) via the Store.
I recently had the dead screen that appears quite common with HP notebooks.
I connected an external monitor, notebook was fully functional.
Backed up all contents, then updated graphics driver, no improvement.
Then went into msconfig and forced boot into safe mode...
Now, I cannot control the notebook at all because I can't see anything. At this point I am just trying to get control of the notebook so I can wipe it, and sell it to a repair place, or as a notebook that works fine with a docking station or external monitor.
Questions I have:
1. WITHOUT SEEING THE SCREEN (dead) is there any way to get it to boot back to Windows Normal mode, or any other HDMI-driver enabled mode?
2. As an alternative is there any way I can get it to boot from a USB to any operating system so I can wipe the HDD and start again?
3. Would (2) even work if I need a HDMI driver to operate the notebook - would it be possible to reinstall an OS with a dead screen, because I would need to be able to run an external monitor?
4. How do I find my Windows Product Key without access to the notebook (can HP help here, from my notebook serial #)?
5. Any way to perhaps mount the HDD externally in order to manually edit the boot config to return it to Windows Normal booting?
Grateful for your comments. Remember my objective is NOT TO FIX IT, just to get it to drive an external monitor again so I can part with this notebook with some kind of financial return.
Dom

Hi @Dom_Oz ,
Welcome to the HP Forums!
It is a terrific place to find answers.
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
I see that your display quit and you connected an external monitor and it was functioning well. You backed up all your data and updated graphic drivers but there was no improvement. You booted into safe mode and now both screens are blank.
Since both screens are blank when you booted into safe mode, I would try a Performing a Hard Reset or Forced Reset.
to try and bring back the external monitor.
If that does not work, can could try to do a recovery Performing an HP System Recovery (Windows 8)
The Windows product key is tattooed in the bios and is hidden, but if you do a recovery it should automatically get picked up.
Yes you can try booting to an OS on a USB stick to wipe the hard drive.
Yes you can remove the hard drive and install it in an external case and then edit as you wish or format from there.
If you edit the boot config and manage to have Windows reboot, I would do a factory recovery, this will format the drive and return back to its original condition.
I hope this helps.
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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