HP Spectre x360 screen goes black when idle for too long or after locking. Hard restart will resolve

[dev_n]

Hello, I have seen this question asked a few times in the community but I have not found an answer that has helped me. 

Problem:

When I lock my laptop or close it and try to visit it > 10 seconds later, I get a black screen. The power button has a solid white color indicating the laptop is powered on, but it is not functional. After performing a hard reset it starts fine. However, this is very annoying as I have to frequently do this. 

Diagnostic Steps Taken So Far:

1. I have restarted the laptop and pressed F10 to enter BIOS  setup menu. I selected and loaded the BIOS Setup Default settings, saved, and started. No change noticed. I performed all the steps outlined in this post: 

https://h30434.www3.hp.com/t5/Notebook-Video-Display-and-Touch/HP-Spectre-x360-screen-goes-black-and...

2. Using HP PC Hardware Diagnostics, I have ran the Fast Test. Everything seemed to pass successfully. Results screenshot shown below. 

Any help would be appreciated. Thank you. 

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Other Relevant Info:

Model: HP Spectre x360 Convertible 14-ea0xxx

[dev_n]

Now my screen doesn’t come on at all when I power it on… permanent black screen