1. have you tried turning it off and on again? Also what about your cpu governor, maybe its clocked too low or something? Maybe you should try a fresh install
2. I believe, because weekly is more up-to-date than stable, that you should wipe...
Have you tried installing drivers with flashtool?
Have you got access to a linux distro? because thats how I was able to connect my bricked xperia go in fastboot mode.
Maybe try unistalling your drivers and reinstalling them.
Try turning it off, then holding down the volume down (or up?) key when you plug it into the computer, the LED should go purple or green or something. Then see if it shows up