I got tired of using AAs so I bought a play and charge kit last night - but I can't get it to do anything except freeze my 360. If I turn it on with the charger plugged in I get a red ring and it won't boot. If I plug it in when it's already on the whole system freezes until I unplug it. I can't get the USB ports on my PS3 or cable box to do anything either, the charging light never turns on and the controller seems dead as long a the thing's attached to it.
Any idea what could be wrong with it? It's the first party one from Microsoft. The battery it came with seems to be working fine, it's about 75% charged according to the dashboard.