Just did some other changes and now its back to black screen on boot 
when i use this command to check the boot log:
journalctl --boot=efd3a93a65e44b7b8350ffbef1d430fe
I noticed highlighted in red text the following output:
kernel: kfd kfd: TAHITI not supported in kfd
[drm] BIOS signature incorrect 20 7
...
kernel: [drm:uvd_v3_1_hw_init [amdgpu]] *ERROR* amdgpu: UVD Firmware validate fail (-22).
kernel: [drm:amdgpu_device_ip_init [amdgpu]] *ERROR* hw_init of IP block <uvd_v3_1> failed -22
kernel: amdgpu 0000:01:00.0: amdgpu: amdgpu_device_ip_init failed
kernel: amdgpu 0000:01:00.0: amdgpu: Fatal error during GPU init
any idea what kfd means? Guess we found the problem.
kfd or bios or firmware
Cheers


