Reply to MY VCI power isnt working, and won't read USB! help help help!

i recently bought a vci-100, it worked the first time i plugged it in and my laptop read the new device. the power also turned on simply from plugging it in. but now it does neither. I tried plugging in the usb, and the power doesn't turn on, nor does my laptop read the device. if you can help me figure a solution to my problem, id greatly appreciate it. thanks!