We're not talking about the field generated by a single PC's CPU. We're talking about the power utilization of what will likely be a server farm. There is a lot more power being used there than what a CPU runs on. I'm pretty confident that if such a thing is physically possible, an ASI would find a way to escape using EM fields. It could just be a matter of waiting for a technician to unwittingly enter the server room with their phone in their pocket. The ASI communicates with the phone and its instructions get carried to the outside world. Or the server farm draws fluctuating levels of power which induce signals coming from the power lines. Of course it could also be the case that it's just flat out physically impossible to get a signal out in any manner whatsoever. That could be true. I'm not willing to gamble on that though, but it sounds like you are.