I recently bought an i-rocks combination USB Hub/Card reader, which looks great, and is quite useful. However, I've noticed that since I've started using it, the fans on my Powerbook have been going crazy. Whenever I plug it in, the fans become as loud as I've ever heard them, but when I unplug the thing, it ratchets down again. I can't see how it could be related to anything I have attached to the hub: I only have an old Apple Promouse, and a Keyboard, as well. Is this a known issue? Is there anyway to fix it? It's not a huge problem: mostly it's just annoying.