I have a PSU. When I start it using a motherboard, I get a little over 5 and 12 volts on the respective lines. But when I manually start it (by connecting PS_ON to ground), I get only 4.2 Volts on the 5 Volt lines.
This is causing an issue with the hard-drives that I am powering with this PSU. How can I make it output exactly 5 Volts?
By the way, this is the PSU in question: http://www.enermaxusa.com/psu_emd625awt_ii_sli.php