I am also facing the same problem with lumia 925. It is 1 year and 4 months old. While it is connected to wall charger, the reset process (Volume down + power button) shown blinking of windows logo but the phone doesn't start. When removed from charger, even this doesn't happen. And when connected to computer/laptop, it shows driver not installed successfully.
Now whether repair of such kind is possible or it's just a dead brick.