If you press reset, I think you'll find that it briefly appears. You might be able to time pressing of reset just right (you want to be releasing reset right about when it finishes compiling and starts trying to upload).
What's happening is that once the sketch starts running, it falls off USB because the sketch was compiled for the wrong speed, so it configures the USB based on that.
The brute force solution is to reburn bootloader with an ISP programmer. This will wipe the currently installed sketch.