An interesting issue is the video card.
The only MorphOS supported model that I have is an OEM Radeon HD6570.
It it works with DVI out with AmigaOS 4.1 and Linux but not with MorphOS.
I can only get a display with MorphOS by using a DVI to VGA adapter.
This results in an default 800x600 display .
I used to have the same issue under AmigaOS 4.1 with this card but later versions of the RadeonHD driver and OS have solved this.
Waiting for MOrphos to support my newer video cards ,the HD6670 and HD7750.