... functional check in specialized trade.The methods of operationa. Plug power supply 24PIN and P4, P6 or P8 into the corresponding ... jack 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 is ... 12V power Good (PG)Connectors : Floppy, HDD, CDROM, SATA, 4 pin (P4),8 pin (Dual-CPU),6 pin (PCI-Express) LCD power supply tester