I'd recommend always checking the output voltage of the ports themselves to be sure that you're not going to fry the ASICs when you plug them in.
To do so, find any cheap USB charging cable (can find microUSB or 30 pin iDevice chargers for under $1 on ebay) and cut it open to expose 4 wires (not sure if 30 pin would have 30 wires... seems unlikely, but I haven't cut those open) and then connect the red and black to your DMM for checking the voltage.
It should read 5V, or anywhere from like 4.8V to 5.1V (those seem to be safe ranges, from where things will work and not fry).
For my USB stick rigs, I used 10 port strips like
http://www.ebay.com/itm/New-High-Speed-10-Port-USB-EPYP-2-Hub-Multi-Outlet-Power-Strip-Type-/141200097037For PSUs, I used 5V 5A on each hub. The cheap one I got from China got hot, yet still supplied power to my hubs reliably for a few months (haven't had it die yet). My preference is Amperor 5V 5A, since they are decently cool to the touch when mining.
If you want to use your current PSU, I'd recommend checking out what the ports are outputting. If it's not 5V... you might have dead miners