Same thing here I have a Z64-A with Debian running. runs perfect of you boot it with HDMI connected and keeps running if you disconnect HDMI. But won't boot when no HDMI is connected at power-on.
I have found a HDMI headless (dummy) plug on AliExpress. For less then 2 euro's. I am going to give this a try.
Also tried disabling the Integrated graphics card in bios. But this did not solve the problem. And was a pain to get back up and running. (You need to press and hold the pinhole button on de bottom of the device when powering on the device to recover from that one and redo your boot loader install.)
Hi
Can you write detailed steps how to install debian on this machine ? Thank you !