PowerBook runs HOT with iPhone connected

Has anyone else observed their computer running hot (fans rev up real fast!) while their iPhone is connected? I'm still waiting for "the new at&t" to get my activation unclogged, so maybe it's just because my iPhone is still in a pre-activated mode, but whenever I connect it to my 12" PowerBook G4, the computer starts heating up and revving its fans like it is working REALLY HARD. A check of the Activity Monitor shows that the CPU is below 10% and there are no unusual messages flooding the console.log or system.log ...
Anyone else seeing this?

Yes, my PowerBook revs up even when both it and the iPhone are idle (screenlocked even-- the iPhone not the PowerBook!)
But you have a point.. maybe the problem has something to do with the PowerBook's power management chip. I'll try following Apple's PMU reset procedure tonight when I get home. While I'm at it, I'll try an Open Firmware reset too.
I'll post my findings..
Thanks everyone for your help on this!
My fiancee's iPhone connects to her 1.25 GHz 12" PB
without the rev-up problem most of the time. But it
does rev up when it's doing anything remotely
computationally intensive, like resizing photos. If
yours is doing that just from being connected, that
is strange. What is the internal temperature of the
PB? (There are some programs and dashboard widgets
that will tell you, I think - not sure what
thermometers the 12" PB has.) Maybe you have a vent
blocked or something.
This might be becoming a question for the 12" PB
messageboard - maybe it's a general problem with
high-drain USB devices on some models?
Have you tried hooking up the iPhone through a
powered USB hub? That would perhaps isolate if it's
a current-drain issue. Maybe this is a symptom of
other power-supply problems with the PB.

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