I am unable to connect my laptop to an external 4k display, it does not recognize that a monitor has been connected and the monitor goes to sleep. My laptop is the Spectre x360 Convertible 15-bl0XX and the product number is Z4Z35UA#ABA. I am trying to connect through the HDMI port to a brand new LG 32UD59 4k display. I am able to connect a different laptop to the LG monitor with no issues. I have tried changing the HDMI cable besides the one that came with the monitor. I have tried different HDMI ports. I am able to connect the HP to a lower resolution (full HD) monitor with no issues. I've downloaded the latest drivers and have reset the BIOS as described in one of the solutions, all to no avail.
Any help would be GREATLY appreciated! Thanx!