did you have your jamma harness plugged in all the way?
Probably the usual to start. Check the voltage on the board for 5v-5.1v and reseat the socketed chips.
Edit: maybe add some board pics?
Try playing it to see if it's just the graphics messed up. Insert coin, press start. See if music is fine etc. if it doesn't play at all, verify the program roms first.