I just got my OPUS 150, the only problem is, I have an HP board, which has a 20 pin standard ATX connector. However, on my HP powersupply (AC-DC) there are 19 wires, a standard connector, with one blank. From what I can tell, the wires that are there are exactly the same configuration as a regular supply. The missing pin is the -5v. The computer worked fine like this, but I am not sure if I should leave the OPUS pin in, or take it out. Any ideas?