im in the same situation, had numerous sets of boards, when mine does the first corner, I get a white track, and unable to drive, I have reseated roms, and same, walked away from it for months as had other stuff going on, came back to it today, and now the bloody trees, buildings all are messed up ARGGHHHH! anyway can someone tell me please, what voltages the switcher is kicking out at both the switcher outputs and then also if the voltage is the same as plug 'A' what is the voltage there? as if I set the switcher to 5.05v then at connector A its about 4.78, so if I jack up the voltage to be around 5v at plug A then at switcher its high, and should it have 2 continous red leds on the board? after 1/2 day messing with boards, cables, roms, and still no joy, this could be put back for another year before I mess with it again, someone? anyone? please can you help?