I've lost track of how many times Targus has replaced some part of mine. Sometimes they replace the "brick," other times it's the cord from the brick to the PC. Last time, they sent me an entire new unit. If it weren't so dang handy (I buy the IGo adaptor and tips for cell phone and PDA power), I would have dumped it awhile ago

Does it work in AC mode?

Best bet is to call or go to website and see what they'll do.