... trade.The methods of operation Turn-on your power supply ;Plug-in your 24 pin power supply connector to mini tester;Check ... , +12V,+3.3V,-5V,-12V,+5VBS,PG);Plug HDD con, check +12V, +5V;Remove HDD, Plug P4(P6 /P8) con, check +12V ... ;Remove P4(P6 /P8) con, Plug FLOPPY con, check +12V, +5V;Remove FLOPPY con, Plug SATA con…, check +12V, +5V,+3 ...