You didn't check out the forums. There have been similar posts every six months or so.
Step 1: Check for alternative firmware (if it shows up the korean fw, try holding select during boot. If it shows a selector with stuff like pacrom, you're in)
Step 2: Search the boards for the dealextreme-link - they sell replacement cables/adapters that work for cheap. They're not sold as GP32 cables though, I think.