Not sure what OS your G4 is running, but I use this in a pinch
[
www.macroplant.com]
At one point I think it was free, but looks like you have to pay for it now. You may need an older version, depending on the OS you are working with. I admit, it's a bit clunky, and will take forever with your iPhone 4S (I've got one too and the transfer does take a long time) - but it works.
For images- if your version of OS has it - image capture
Edit: Sorry! Reread a follow up post. Not sure what to do when the computer does not recognize it. That's a problem. Try a new cable?
Edited 2 time(s). Last edit at 11/05/2016 07:23AM by Spiff.