I need to find out how to test PG or PWR_OK on the PSU "DPS-300AB-73 B". It does not have a "blue" cable that most standard PSU's have which is for the -12VDC or in some cases (Blue) Power Ok (+5V & +3.3V is ok) on the HP Workstations. The computer this PSU came from was an HP Envy 750-124. Have tried many PSU tester and get the same result PG 0sm or PG F on the Dr. Power II tester. Thanks for any help.