remove rom, clean using a pencil eraser, try again

try with just 2 roms (think it will boot with just 2...........try with none!!)

-

reseat video rom (chip above cpu in picture)

-

remove battery and try again

-

all else fails get a meter and test continuity on UE8 from pins to via's.

-

do the same on UD8 , UF8 and UG8