hello, i had this same problem and i found out that the ROM 0 chip was in the ROM 1 socket, i changed the eprom and it worked, also check the ribbon cable the red stripe n the DMD goes from right to left on both conectors. by the way does anyone have a wiring diagram for the HD74LS245P ? i looked on the cpu diagram but the IC thats in the manual has 18 pins while the one installed has 20 pins.. my star wars doesnt boot and i removed this component by mistake ( was kinda drunk, 3 am, no sleep) i was supposed to change the 74LS273 (the one that controls the coils) well the thing is broken and it wont boot up =) if anyone can send a detailed picture or diagram of how this 74ls24p is connected? the board got messed up and i cannot see how to repair the broken lines. Thank you !