IPod (40G) started mains humming when connected to audio amp via dock

I have had my iPod connected to my audio amp through the Apple docking station while also connected to the Apple charger.
This setup worked for many months, especially when I purchased the infra-red remote control and could run the setup from my couch.
Recently, without making any obvious changes to the system, a loud mains related humm is heard. I know a thing or two about electronics, and I'm sure it's not a ground loop. The humm is also not coming from a defective loader because the 12 volt is clean (checked with a scope). The only way I can get rid of the humm is by connecting the headphone output to the input of the amp. This works, but now renders my remote control useless.
I suspect the docking station or a ground fault in the Fire-Wire cable, but I have no spares to switch them out.
Any out there with the same problem, or any ideas?
Tks,
Paul
PC Windows XP Pro

If you are so sure that it is not the grounding issue of you audio system (make sure you did not make any change on wires or added any electronic device), then it could be caused by one of the following
1. iPod itself (but unlikely)- try to do a Reset or Restore to factory setting
2. Faulty iPod cable
3. Faulty iPod ac charger
4. Audio cable connection between the dock station and amp
5. iPod dock station (likely poor contact between your iPod with the dock station)

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