It's not uncommon for those USB interfaces to have trouble powering from many PC USB outs. They will draw more current than many computers are capable of delivering. If you or a friend have access to one, try a powered USB hub. As far as the power supply, make sure it's the right one (polarity, current rating, voltage, AC or DC, etc.). Measure the power supply output and make sure it works. Check the DC or AC input jack on the Fast Track and make sure it doesn't have cracked solder joints. Many devices have a protection diode across the power input to prevent overvoltage and/or wrong polarity voltage from entering the device. Check to see that there isn't a shorted diode across the power input. That's all I have without a schematic and good luck getting one.