... of the power test suite.b. Power on the supply of power, will hear "DuDu" ring, if no flicker then the power supply output voltage ... : 20/24pin (ATX-connector)Voltage test : +12V,-12V,+5V,-5V,+3.3V,5V Stand by (SB) 12V power Good (PG)Connectors : Floppy, HDD, CDROM, ... SATA, 4 pin (P4),8 pin (Dual-CPU),6 pin (PCI-Express) LCD power supply tester ...