Electrical problem
1998 Opel Tigra 6 cyl Front Wheel Drive Manual

hi..i would like to ask about the electrical problem of my car,i just bought it to a friend..the problem is, it dosent give power or electricity to the engine..we check the computer box its okey..ive change the starter..but still no power..please help me..hope to give me a solution for this..
the batteries is fine and the ignition coil is new....what else can be possibly go wrong??

i dont know what the engine size,wheel drive type,..thank you!