Are you doing the recovery with BIOS 035?
Have you tried testing a different power adapter?
Is there any chance to test a different HDMI port?
Yes. I tested it in another monitor-tv that it uses another STK1AW32SC.
Based on your description and troubleshooting it seems like the unit is bricked, so the at this stage the next will be replacing the unit. Please contact us directly using our contact options in order to check the warranty options for your unit: Contact Support
Again, my apologies for the inconvenience caused.
Thank you, Amy.