... to mini tester;Check LED light if ON or OFF (+5V, +12V,+3.3V,-5V,-12V,+5VBS,PG);Plug HDD con, check +12V ... , Plug FLOPPY con, check +12V, +5V;Remove FLOPPY con, Plug SATA con…, check +12V, +5V,+3.3V;SpecificationVoltage source: 20/24 pin (ATX ... -connector)Voltage test: +12V,-12V,+5V-5V,+3.3V,5V Stand by(SB) 12V, power Good (PG)Connectors: Floppy ...