Minty Boost Help Answered

So, I plugged in the USB to an iPod Mini and the whole cicuit goes blank. I tried it on some person's MINI, but the light shut off right when I switched the switch. HOWEVER, it did work on my iPod Nano and my sister's iPod Mini. It seems like the circuit is shorting out on the MINI and not on the Ipod Nano. I am thinking it is a problem with the noob sauce's MINI, but I do not know why it is shorting out and turning the light out on the charger. Thanks -Brennn10