the work arround I found is to unplug the battery from the maniboard for about 10 sec and reconnect it.
after that the bios seeting will reset and the box will start.
But you will have to open the box :( be carefull lot of srew and connection...
I have to do it because all my attemp to change thinks in the BIOS fails and I was the same behavior as you describe?
The bios has a bug. everytime I change something and do a "sve and restart" the box will start with the fan starting and nothing on screen.
Finalley after 3 days of a lot of testing :( I have found a workarround : after a change in the bios, do a "save" and then exit the bios. In the way the changes in bios are kept and the box start correctly.
Question. Does a gr 9 have a clear reset button or reset hole you can press using a paper clip so you can clear the cmos bios to factory defaults and not have to unplug the battery? Unplugging the battery seems like a lot of trouble. I would like to know for future reference.