I have an issue with this as well. I have an iBook G4 (purchased in 2006, mac os x 10.4.11) that doesn't recognize my phone when I connect it. My phone recognizes that it is connected, but my mac doesn't. I mount the device but nothing happens. Is there anyway to fix this?
I did find a way to circumvent the problem via bluetooth, but I was hoping to have all options available.