At the weekend I'll have some time to fiddle with it.

I think I'll try to boot Serenity first from USB, check if it wants to boot at all. Maybe I'll got an Arduino to use as serial monitor to check the log.

Then move on to flashing the grub image to the HDD, again, with a different IDE drive. if thst doesn't work, I'll find a SATA HDD and flash that.

I really wanna see this OS boot on real hardware. Then take a good lookaround and develop or port something for it :)