I have attempted this as well sorry i did not post that in the original thread. when i plug it in with this option set it will ask me mass or media i select mass and wait over 10 minutes and nothing occurs. so it seems in that case that it is recognizing somewhat that it is connected to the computer.
This is a rather common and ongoing problem with this phone. I've experienced it from time to time, sometimes I've had to uninstall and reinstall the drivers, sometimes trying a different USB port works. Recently, my computer totally stopped recognizing the phone at all. Tried it in my wife's notebook and it worked fine. I ordered a new micro USB cable, and now my computer detects it instantly with the new cable, but not with the old one. Every time it seems to have a different cause.
I'd say start by getting and/or trying a different cable if you have one. When I look into the ends of both my stock cables, I see green corrosion inside the micro USB end, and the cables have never been near water. I think it's just a really cheap cable that's prone to failure.
I had the same problem... It was a faulty usb cable... I had used a usb cable for my wife's LG phone and it didn't detect the phone. However, using another usb cable specifically for the fascinate did the trick.
Same thing happened to me. It's the USB port on the phone. I did all the troubleshooting you did plus some and nothing fixed it. Then I found I had to pull the cable towards the screen and all worked fine. So I grabbed my brother's cable, same deal. And then tried his girlfriend's cable. Same results, both cables for the Fascinate.
Sorry to say, but it will only get worse. Mine doesn't work at all now. Going to call for a refurb today actually.