so I had tons of issues all stemming from not being able to connect to my pc's. I tried 4 different pc's. This was going on for three weeks.
I finally sent it to Josh at mobiletechvideos.
He replaced the USB port and upgraded my phone to GB.
I am posting this because I found no help here or XDA. He sent the bad usb port back which I can see the burnt connection points.
I thought it was a software issue after trying all sorts of factory restores, backups, etc...
Now my phone is updated to GB, rooted, and connects to my pc.
I hope future samsung galaxys have easier ways to sync and upgrade and not rely on usb connections,IMHO!!!!
Good luck with all your issues but you might want to look into hardware issues. I also found one of my usb cable had the identical issue. making me believe I plugged it into my phone which created short in usb. now I am very carefull to observe my usb cable to make sure it is clean.