Coming to you again!
After countless attempts to install Lion Mountain, I stopped, still boot error. Snow Leopard install a breeze, no problem. I checked the bios. Installed with bootpack Extra (boot with text-verbose), then with the Extra forum guide.
The hardest thing, because even before the Mountain Lion has been installed on the same drive. I have a question: in Disk Utiliti not displayed in the Info Mount Point myHack Install from USB. From HDD shows Mount Point. I feel as if the bootloader is not installed on the disk. Someone has an idea?