@hiscritic
Thank you for posting on the HP Support Community.
This sounds like hardware related issue with the computer, however, shipping the unit in for physical diagnosis will resolve the issue,
I would request you to contact our Support and our Support Engineers should be able to check the available service options for your computer. HP Support can be reached by clicking on the following link: www.hp.com/contacthp/
Note: You can remove the HDD from this computer and you can connect to a different computer or laptop to retrieve the file/data.
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.
ECHO_LAKE
I am an HP Employee