A bit of a late reply, but the problem is that it doesn't reach the stage in which I could do something within Lightroom itself. So I cannot follow these steps. Also, Finder can't find the mentioned map that I need to reach in case Lightroom doesn't start up.
What to do instead?
If you scroll down on the troubleshooting page linked to you will find a Manual way to disable the GPU option with LR closed.
Thanks JSM. But the thing is I cannot find this: %appdata%\Adobe\Lightroom\Preferences\Lightroom 6 Preferences.agprefs.
I don't know what operating system you're using. But on Windows it is necessary to go to the folder options and put a checkmark in the option to show hidden folders. Then you should be able to find the path that you need.
I'm on a Macbook unfortunately :-)
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It is in the same preference file on a Mac but in a different location.
File locations in Mac OS X
Note: The user Library file is hidden by default on Mac OS X 10.7 and later. For temporary access to the user Library file, press Option and choose Go > Library in the Finder.
The Lightroom application file /Applications/Adobe Lightroom/Adobe Lightroom.app
In Mac OS 10.9.x and later, to reset Lightroom's preferences, after you delete the above file, restart your Macintosh. Also, beginning with Mac OS 10.9, to fully reset your Lightroom preferences, in addition to deleting the plist file, press the shift + option keys immediately after you restart Lightroom, and select Reset Preferences from the resulting dialog box.
Catalog /Users/[username]/Pictures/Lightroom/Lightroom Catalog.lrcat
Preview cache /Users/[username]/Pictures/Lightroom/Lightroom Catalog Previews.lrdata
Smart Preview cache /Users/[user name]/Pictures/Lightroom/Lightroom Catalog Smart Previews.lrdata
Catalog lock file /Users/[user name]/Pictures/Lightroom/Lightroom Catalog.lrcat.lock
Note: The lock file prevents the catalog from being overwritten when in use.
Catalog journal file /Users/[user name]/Pictures/Lightroom/Lightroom Catalog.lrcat-journal
Open catalogs use the journal file to check for incomplete database records. Do not delete the journal file unless you're deleting its associated catalog as well.
Catalog backup /Users/[user name]/Pictures/Lightroom/Backups/[date and time of backup]/Lightroom Catalog.lrcat
Presets and templates /Users/[user name]/Library/Application Support/Adobe/Lightroom/[preset or template folder]/[preset or template filename.lrtemplate]
Serial number /Users/[user name]/Library/Application Support/Adobe/Lightroom/Lightroom 6.0 Registration
Thanks, this helps!