About rooting: while rooted phones are nice, don’t do it if you aren’t experienced with rooting. Also, rooting literally has no impact on what you’re trying to do.
Secondly, this happens sometimes. If it was working before it’s probably not a driver issue.
Try the following in no particular order:
- Unplug, turn debugging off, turn debugging on, plug back in.
- Change transfer type(though shouldn’t matter).
- Restart computer.
- Restart phone.