Black screen no boot

[Brithan]

Have a Pavilion x360 that powers on and stays on but has black screen, does not display anything and does not beep at all. Laptop stays on until I power off. I am pretty certain this laptop does not have a cmos battery so i assume disconnecting internal battery does the same thing. Sometimes caps lock is on sometimes it is off sometimes it is flashing...

Have tried the following

* Power reset

* Disconnecting battery and running with ac power

* Reseating ram/new ram

* Holding down power button + Windows + B or R to reset bios

* Downloading Bios and installs onto USB then repeating the above

* Connecting external display

[Echo_Lake]

@Brithan

Thank you for posting on the HP Support Community.

I appreciate your efforts to try and resolve the issue. This sounds like hardware related issue with the computer as it's not powering on. 

I would request you to contact our Support and our Support Engineers should be able to sort this out. HP Support can be reached by clicking on the following link:  www.hp.com/contacthp/

Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.