When you turn on the system and it asks for the system disk, i am assuming you are talking about the purple screen of kickstart 2.x right?
Will it boot normal disks from there?
You might unhook all the extras, and then try starting with a known working autobooting game disk, then add things in each time you power down. A beefier than normal power supply would be good luck too! Did you just buy this, or unbox it from ages past
