My USB ports only work if i unplug them, swap them around and plug them back in. Its driving me crazy! I have done a pram and smc  reset, reinstalled lion and spent two hours on the phone to apple. Now what?!!

I have a optical lead coming out of the headphone jack in to a dac that goes in to my amp (which has speakers connected) so i can listen to music. The Dac is powered by usb. Recently the sound stopped working. I called tech support and they suggested the resets (pram and smc) and i reinstalled lion and reinstalled itunes, deleted audio files, blah blah blah.
So now when the computer turns off, or indeed randomly sometimes, I have to uplug the usb cable and put it in a different port, it then works. If I then put it back in to the original port it still works. Totally baffled. Can anyone please help. i have 3 children who are getting very bored at the sight of my growling perplexed face and the sight of my back!

I don't know why that happens, since I don't own products of this type...  However, if the sole purpose of the USB connection is to provide power (not a data connection), can you connect it to something that just provides power, such as a USB power adapter (like the one that comes with iPhone)?
http://store.apple.com/us/product/MD810LL/A/apple-5w-usb-power-adaptor
Or, if it needs to be connected to a USB port, it might work properly if you get a self-powered USB hub and connect the USB cable to the DAC to the hub.  The hub would act like a "buffer" between the DAC and iMac.  It needs to be "self-powered" (comes with its own power supply). Here's one such USB hub
http://eshop.macsales.com/item/Newer%20Technology/USB2HB7PRO/
Do you have anything else connected to USB (other than standard keyboard and mouse)?  If so, have you tried it with ONLY the DAC connected, to see if the problem recurs?  USB devices can interfere with each other.

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