I not clear here from your description. Is this correct - the laptop display works but you are getting error meassages. Please correct me if I’m wrong?
* Have you run the HP Diagnostic software?
https://support.hp.com/us-en/drivers/selfservice/hp-pavilion-gaming-15-dk0000-laptop-pc/26122224
* Have you updated the BIOS?
* Looked at Service Manual:
http://h10032.www1.hp.com/ctg/Manual/c06377664