... functional check in specialized tradeThe methods of operationPlug power supply 24 pin and P4,P6 or ... the corresponding jack of the power test suite Power on the supply of power,will hear (DuDu" ring, ... PC flicker too,then the power is failed SpecificationVoltage source:20/24pin(ATX-connector) Voltage test:+12V,-12V ... ,+5V,-5V,+3.3V,5V stand by (SB) 12V power good(PG ...