Originally Posted by dumzo
Is there anyway to tell if I really did fry the thing?
You probably did not fry the thing -- it's just a coincidence.
Motorola chargers have generally worked fine with BlackBerries, including mine, your report is the first time I've heard of this.
It is true in the past that mixing chargers is never a good idea, but USB chargers are a whole different story altogether -- USB has standardized voltages and currents (5 volts at up to 500 milliamps). So all the different brand computers USB ports and different brand USB chargers, should work (the good USB chargers with automatic charge negotiation work best -- Motorola, for example, works fine.)
Also, Error 411, I believe, is a radio problem, which is unrelated to charging.
Claim your warranty and you should be fine. No need to mention the charging -- it likely did not cause Error 411.