XPS 17 Unusable after Dell Support Experience

I'm currently in a back and forth with Dell Support and not sure where to turn next. 

About 5 days ago a technician came to fix the keyboard on my XPS 17. After the repair I tried to play a YouTube video and the second my laptop tried to play sound it froze, the screen went dim, then turned off. When I restarted my computer and ran the audio troubleshooter it said that my integrated speakers were not plugged in. Restarted again and the issue seemed to disappear.

After a few more minutes of use, I tried to play sound again and the same problem occurred. I contact support, ran every possible hardware diagnostic test and nothing seemed off, uninstalled and reinstalled drivers, updated all of them and restarted my computer multiple times and once again the issue seemed to disappear... Then, as you may have guessed this issue pops up again after maybe an hour of normal use.

This cycle continued again, contacted support yesterday, restarted from a restore point, factory reset, wiped all my data, and now my computer won't even get past the Cortana OOBE page (I'm assuming because it plays a sound on first start).

I've been told multiple times by Dell over email that I'd get a call back to follow up, and have received 0 communication both times. I'm paying premium support on a very expensive laptop, only to be left without a computer in the middle of exams.

I need this issue resolved as soon as possible.