Yeah, if you are unrooted then recovery is very limited. You should be able to get a recovery menu (press menu key while on the red triangle screen?) but all it will let you do is wipe the phone. Now if the cause is corrupt data that will fix it, if not it just erases your apps and data to no end.
I'm not sure I can think of much else to try apart from reflashing the software completely (using a ROM Upgrade Utility, a RUU). This will also wipe the phone. What were you hoping to do if you had usb debugging?
To choose an RUU we'll need to know whether the phone had network branded software, and if so which? And which country did you buy it in?
If it's hardware then repair is the only option.
I'm not sure I can think of much else to try apart from reflashing the software completely (using a ROM Upgrade Utility, a RUU). This will also wipe the phone. What were you hoping to do if you had usb debugging?
To choose an RUU we'll need to know whether the phone had network branded software, and if so which? And which country did you buy it in?
If it's hardware then repair is the only option.
