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Look forcaps on far right (2) on the psu if they are swollen replace psu. If caps are not swollen use a meter check dc volts from power supply ( gnd and -55 +5 as labeled on the main board where the pwr cable from the psu plugs into main pcb) If voltages are good lightly touch the 2 square chips (very common failure)right below the station transformers carefull they may be very hot. If not hot replace mcp card and retest.